Well, actually Disney does still have an in-house social games division - they run Club Penguin and numerous failures. Yeah, I know, I wouldn't trust them with it either. (Disney also has a division called
Disney Social Games, a name spawned from the height of corporate creativity, but I can't find any titles so it may be that they're not in operation).
My major point is that Disney has a corporate footprint larger than Godzilla, especially when combined with the others. Even if we do presume they don't want to look too far out from their circle, their circle is just that big.
Whatever the case, Square and Eidos are still here, I don't see why Disney's failure with Playdom should have delayed this for as long as it has.
That is, unless Disney has a contract from the Playdom days saying they get to distribute in North America and no one else.
EDIT: Also, I just don't know if I agree with the "don't want to reach outside their circle" idea in the first place. Why not hire someone external? That's how licensed social and mobile games are developed all the time. Square Enix uses an internal house for Agito; Success Inc for KHX and Praying Brage (and for all I know, several of the other games on Square Enix Bridge, but if I'm mistaken, that's just more companies for my list); a company called CyberConnect2, which actually has closer relations with Namco Bandai than Square, is running Final Fantasy VII: G-Bike; Eidos had N-4 Interactive develop Deus Ex: The Fall for mobile...
Disney might be protective, I could see that and maybe that's what's happening, but Square's approach to social and mobile has been all over the board.
Hell, it's a little off-topic, but if Square Enix established relations with a new house, they could port other games when there's money in it. For example: Praying Brage could be worth good money if it launches around the same time as Bravely Default 2.
It may very well be that Square Enix and/or Disney are doing one of these things as we speak and just don't want to get our hopes up, but if it is, I wish it would go just a teensy bit faster. It's already too late to promo KHX via 2.5HD.