The problem with attempting to appeal to mainstream Disney fans lies in the fact that it's almost impossible to do at this point without blatant rehashing of the movie plots which would likely result in an absolute bastardization of any continuity the games have going for them.

Jiro has it right. Kingdom Hearts has never been directed at the average Disney fan. It's target demographic is largely RPG (specifically Final Fantasy) fans who grew up with Kingdom Hearts. I remember when the first game came out, my 7-year-old neighbor got it and couldn't even make it past Traverse Town.

Any effort to try and placate Disney fans at this point is too little far too late.