In case you've been living under a rock lately, Disney has recently purchased both the Marvel and Star Wars intellectual properties. This means that both could be included with Disney in the next KH game.
I don't think I should have to explain just how awesome it would be to have Final Fantasy, Disney, Marvel AND Star Wars in the same game. Just imagine all the possibilities. It would be almost unreal that something that epic could ever exist. But it CAN be real. And it should be.
I'd be a little disgusted to see what they'd do with Star Wars. You just KNOW they'd make Jar Jar Binks a main character for whatever the Star Wars world would be.
Besides, both franchises are way too complicated to boil down into a single world in a Kingdom Hearts game. Each of them have dozens, if not hundreds of main characters in the already; who would be the focus of the worlds? Anakin? Luke? Revan? Or Spiderman? Iron Man? The Hulk?
In 1984, I was hospitalized for approaching perfection.