I was pretty surprised about how old the threads I found about this are and that they don't try to enter the topic in depth as this war is extremely important, I'd say. You could make the argument that France won the war as Philip kept the throne of Spain, but France didn't gain anything in the short term, instead lost territories in the north like Tournai along with a lot of its population and the alliance with Spain collapsed right after the war. Basically france wins at Blenheim (the thread is kind of about this battle, but this directly results in a French victory so the title still works), so this is to see how much may change this battle in the short and long term.
First, immediate effects. Eugene retreats to reorganise and unite forces with prince Leopold. Marlborough is very likely to die or be captured, due to the tactic he used, and even if he escapes, he will have to return to England and won't receive command in the Netherlands again; there exists the possibility that he's sent to Spain, but I'm not sure. Bavaria is secured in the short term.
Austria, even having Eugene won't make it I'd say, without a coordinated offensive with the Anglo-Dutch army Bavaria won't fall after a single decisive battle, France isn't even forced to give battle and their ability to support the Hungarian rebels will only increase with time. So, how much could Austria actually lose? I'd say Hungary's independence at least is secured, it's borders are in question, Austria might keep Pressburg as it's a threat to its capital; Bavaria should receive something, Tyrol most likely; but is there a possibility of an independent Bohemia or it is too much?
Italy, Turin is doomed, there's no one to delay, nor relieve the siege of Turin, even in the case that France performs in the worst way possible in the Bavarian front the siege of Turin would still start months earlier and Eugene would make his descent months later. Basically, Italy is secured for the Bourbons. How much will France push for? Savoy and Nice are the logical choice, but what will happen with the duchy? Will it become some kind of French vassal? And Milan, will Spain keep it or will it cede it to France? I guess Spain will just keep Naples, Sicily and Sardinia.
The Spanish Netherlands, I think at least a partial French victory in the region is assured. Victories like Ramillies and Oudenaarde were only possible because of Marlborough's forced marches and there's no way Marlborough keeps his position there is he loses Blenheim, distrust between English and Dutch forces will also grow, deteriorating their performance. So, what's the future for the Netherlands? In case of a partial victory Bavarian Netherlands could be possible, or maybe another candidate, along with Dutch forts in the region, but in a total victory in the front? Will Spain keep them or cede it to France?
North America, this is interesting and is often ignored as a front when regarding a French victory in the WOSS. An early French victory (before 1710 at least), would mean that Nova Scotia wouldn't have fallen to the British, this is big; Halifax would become the arguably most important British port (strategically) and best fortress in North America for the century. Not getting it puts Britain in a considerably worse position in the region compared to OTL. Might French North America survive or even expand more than OTL given the state of thing in the region?
France, I previously said that there's the possibility that Milan and the Spanish Netherlands could become French, but there's more about this. I think France keeps Tournai, Ypres and those territories lost at Rastatt; while also annexing Lorraine; I don't think they will try to push for the Rhineland in this war. A shorter war could possibly butterfly the death of the petit Dauphin, which is it's own topic. The alliance with Spain might survive the war and even longer. I think that since France would now have a set of alliances (Hungary, Bavaria and possibly Spain and Austria) and less powerful threats it could focus much more in its navy, being able to compete with Britain.
Like this has even more implications in other regions or when trying to look at long term changes. Like, would this affect the outcome of the Great Northern War? Would an uninterrupted union of Spain and Southern Italy affect the culture of the second? Would the reforms of Nueva Planta be applied in Italy? Is it possible that we see a Bavarian as HRE and how could this affect the institution? Might this affect the development of the various East India Companies?
First, immediate effects. Eugene retreats to reorganise and unite forces with prince Leopold. Marlborough is very likely to die or be captured, due to the tactic he used, and even if he escapes, he will have to return to England and won't receive command in the Netherlands again; there exists the possibility that he's sent to Spain, but I'm not sure. Bavaria is secured in the short term.
Austria, even having Eugene won't make it I'd say, without a coordinated offensive with the Anglo-Dutch army Bavaria won't fall after a single decisive battle, France isn't even forced to give battle and their ability to support the Hungarian rebels will only increase with time. So, how much could Austria actually lose? I'd say Hungary's independence at least is secured, it's borders are in question, Austria might keep Pressburg as it's a threat to its capital; Bavaria should receive something, Tyrol most likely; but is there a possibility of an independent Bohemia or it is too much?
Italy, Turin is doomed, there's no one to delay, nor relieve the siege of Turin, even in the case that France performs in the worst way possible in the Bavarian front the siege of Turin would still start months earlier and Eugene would make his descent months later. Basically, Italy is secured for the Bourbons. How much will France push for? Savoy and Nice are the logical choice, but what will happen with the duchy? Will it become some kind of French vassal? And Milan, will Spain keep it or will it cede it to France? I guess Spain will just keep Naples, Sicily and Sardinia.
The Spanish Netherlands, I think at least a partial French victory in the region is assured. Victories like Ramillies and Oudenaarde were only possible because of Marlborough's forced marches and there's no way Marlborough keeps his position there is he loses Blenheim, distrust between English and Dutch forces will also grow, deteriorating their performance. So, what's the future for the Netherlands? In case of a partial victory Bavarian Netherlands could be possible, or maybe another candidate, along with Dutch forts in the region, but in a total victory in the front? Will Spain keep them or cede it to France?
North America, this is interesting and is often ignored as a front when regarding a French victory in the WOSS. An early French victory (before 1710 at least), would mean that Nova Scotia wouldn't have fallen to the British, this is big; Halifax would become the arguably most important British port (strategically) and best fortress in North America for the century. Not getting it puts Britain in a considerably worse position in the region compared to OTL. Might French North America survive or even expand more than OTL given the state of thing in the region?
France, I previously said that there's the possibility that Milan and the Spanish Netherlands could become French, but there's more about this. I think France keeps Tournai, Ypres and those territories lost at Rastatt; while also annexing Lorraine; I don't think they will try to push for the Rhineland in this war. A shorter war could possibly butterfly the death of the petit Dauphin, which is it's own topic. The alliance with Spain might survive the war and even longer. I think that since France would now have a set of alliances (Hungary, Bavaria and possibly Spain and Austria) and less powerful threats it could focus much more in its navy, being able to compete with Britain.
Like this has even more implications in other regions or when trying to look at long term changes. Like, would this affect the outcome of the Great Northern War? Would an uninterrupted union of Spain and Southern Italy affect the culture of the second? Would the reforms of Nueva Planta be applied in Italy? Is it possible that we see a Bavarian as HRE and how could this affect the institution? Might this affect the development of the various East India Companies?