Difference between Brink and Bulletstorm is huge.
While Bulletstorm failed to profit, it received good scores and feedback generally creating goodwill towards its name, its dev and its publisher. Hence Epic saying they don't care People Can Fly will do more shit.
Brink was a total fuckup.
Rage will surely sell ok, but will it be a huge hit? Don't think so. I don't really know how big ID is and how they make money nowadays. I mean they must have a super small team, since their last game that they developed themselves is Doom 3, form 2004. According to a 2008 article Doom 3 sold like 3.5 million copies (which according to Wiki is their most succesfull project to date!!!).