Well bye bye frances status of a great power. But one way i could see it is a better performance in the hundred years war if the english can capture the south which I believe they did at one point 1360 I believe. then maybe they hold onto this land maybe further secure the south then at the wars end the french crown splits into two a crown of Occitania and a crown of france which would give the english a new crown and a bunch of french land in return enlgand drops their claim. and then eventually you have the Occitania crown seperate from the English king then you have a sweet independent Occitania. And if you really want to screw the french then declare brittany an independent state oh i would feel very bad for france