Obviously, with the announcement of super specifications required in order to play the game on PC, I'm not sure the game will be successful as much as San Andreas in the modding community.
Saleswise, I think it's too soon to say. There's still the exclusive DLC on X360 that might boost a few more sales.
Random game thought :
Why is Bionic Commando Rearmed 2 getting so much hate? We finally get a real game and they're not even satisfied... I'm starting to hate the gaming community so f****** much...