My main worry looking at this is could it put the future of KH into question if Disney suddenly want to take over it entirely, and don't think I'd trust them to handle it. Also if it affects future Insomniac Marvel games from existing, they've been doing great so far, so a shame if they lose the oppurtunity entirely.
Otherwise, Disney investing in gaming may be a good thing for gaming in general and their IPs at least, at least their approach of letting almost anyone make a game with their IPs and then monetising the hell out of them probably ain't doing a whole lot of good for them, I think they could just need more restraint around who develops stuff with their IP and how they decide to monetise it.
Acquiring EA to accomplish that though.. (And from a company that has already acquired a LOT and apparently can't even deal with that completely) I can't say I find them exactly perfect either, remember the mess with SW:BF2 that was bad enough Disney actually got dragged into it? Ha. I think EA have only really done good with the Star Wars Jedi games so far (and it's only good if you ignore the complete mess around the PC ports in particular), I hope Iron Man will be great and we'll see about Black Panther, maybe they'll be tests to see if they're worth acquiring, but with how the industry is on an acquiring spree atm, maybe they'll be pressured to acquire sooner.