You guys don't even realize just how popular KH is, and I say this from Experience. I know a lot and I seriously mean a LOT of non-disney fans who've herd of the game and who love it too. Also, try not to forget that Square also owns part of KH, Sora and Co are Diseny, and I think Kari, Riku, and the 13 are split among them.
I myself have thought up a HUGE scale ride on this, and even imagineered a TL(or maybe just a seprate them park since it turned out huge) based on World that Never Was( and other elements, I mean that literally). I would post my drawings, but I'm in Texas right now. Trust me, I want this to happen, even if it is something small, although I think Sora as a meet and greet would be odd. I thnk it would be better to have something like Turtle Talk with Sora and Co, or just have them narrating, or taking over the animation building like Nemo did to Living Seas.