Some great ideas and my ideal would be something of a combination. I feel that WDS should be given over to Marvel, Star Wars and any other live action IP, Indiana Jones for example, along with Pixar.
I would then put 'modern' IPs into a third park - Frozen, Moana etc alongside the Toontown idea. Plus I'm stealing with pride the muppets land idea, absolutely love that.
Keeping Disneyland Park traditional, maybe with a couple of additions, Splash Mountain with some warm water magic moving into Temple du Peril area (now relocated to WDS) and maybe Jungle Cruise in the same area.
Anyone got a spare Ä4bn?