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Online-ness wouldn't really work since there are not enough characters that are able to do anything. So they would have to let you make your own and I see that going very badly.
Though not the idea of online I have thought about there being just a game where you pick a character and fight. Playing as Sora forever gets a little boring.
It might've worked, I wouldn't mind too much seeing something epic like the Keyblade Wars MMORPG or something. However, that won't really be KH, now will it?