What if they traded their Marvel IP to Disney for rights in perpetuity to the Simpson's IP? That way they could redo Marvel Superhero Island which desperately needs redone because Hulk and Spiderman are falling apart. And, of course, they get to keep the Simpsons.
And the side benefit would be that Disney World could create a Marvel area so immersive we would think we're actually in the movies. It's so amazing of an idea I can't believe it hasn't happened yet!
... There ya go.