It'd be rad if someone could make a fan server for the game like what happened with Sonic Runners, or some kind of Android emulation or something. At worst, I think we'd lost the microtransactions and online team aspect of the game, which would cripple it a bit, though the former is disregarded by a lot of players anyway. But I'm not sure either of those options are even possible. It sucks that such a high profile (albeit mobile) addition to the series is basically vanishing just like that, though I guess stuff like Nitro Kart 2 isn't faring any better; being confined to old iPod Touches and apparently unemulatable?
At least the game will survive in YouTube footage, I guess.
There's of course also the infamous Tweet they made promising more content coming to the game that they went silent on for a year and will now never deliver, including a new fight against Madame Amberly.