This is something I was wondering about. Sure, France and Buddies took on the Grand Alliance, which encompassed much of Europe, but it seems like the Grand Alliance frayed and disagreed on many things, and France and Buddies were never categorically outmatched.
Could they have won? If so, what happens next? Do Britain, Austria, and German states keep backing pretenders against France/Spain? Will France and Spain eventually unite under a single monarch? Will colonization and decolonization look different?