Hold up Half of kingdom hearts revolves around disney characters.... how do you like kh games if you dont want disney characters in it???
Actually, KH revolves around 99% Disney characters and 1% FF characters.
As for the topic at hand,
I haven't seen WALL-E yet ( I really do want to), but I'm going to say no.
This is mainly because, from my understanding, it takes place when humans abandon the world, and go live in space.
So, I have issue with KH Worlds that would essentially need two complete worlds.
The same goes for Treasure Planet.
I mean in TP, they are looking for the world Treasure Planet. But how would you do that as a KH world? You would need like two worlds when you can only have one.
I don't know if this is making any sense, but basically I don't see how it could work.