It appears that this is the end of Playdom itself, even. I guess, as a fully-owned subsidiary of Disney Interactive, this was bound to happen sooner or later (since Disney said they don't want to make games anymore, just license them to outside companies).
They apparently shut it down not because it was doing badly, but because just MAA2 was doing badly, so Disney just threw out both games and called it a day. (That's also shades of CoH, since CoH itself was still turning a profit, but Paragon Studios as a whole was not, so they shut down everything)
I know there's other Marvel games out there, but I like the turn-based RPG combat system and the Deep Cuts into Marvel lore. There's loads of Marvel games where you can play as Iron Man or the Hulk, but where else can I make a team of Elsa Bloodstone and Howard the Duck? Or Mantis and Knight America? Or Ronan and White Tiger?