Well, it's already been revealed that they're going to use totally new characters or something. They already used up a lot of Disney and will have to start picking obscure stuff, so I don't know how they can keep making Disney based worlds.

And by the way, Studio Ghibli is sort of popular in the US. See, Disney has an agreement with Pixar, and Pixar has an agreement with Studio Ghibli to distribute titles. So, it could also make sense to put both Disney and Studio Ghibli worlds in the same game, although do you have any suggestions as to new Disney worlds? I think they've used up all the popular ones.

Also, if you played KH b/c of Disney, well, by the time KHIII comes out, you probably will be a teenager, and so you won't play it for Disney but maybe for the FF characters or for the KH series itself. And it looks like the more mature look of KHIII has already been established by the look of the characters, unless they change that. Unfortunately they do remind me of power rangers, which I don't think is good, haha.