In all seriousness I would happily take the game and maintain it. I might not have any game development experience but I'm sure id be able to at least keep it running and figure out how to do basic things ie. Live Ops, and the servers would pay for themselves by people kind enough to donate by way of IAP. Eventually who knows, I might learn a few things and be able to improve it, or have enough funds to hire someone who could.
Gree aren't going to make any money off the game any more, in fact they will lose money, so I don't see anything stopping them from handing it over to keep it alive - aside from the assets, which I doubt since they are, as mentioned, an investment company