Yes but it would be different mode it wouldnt be FPS and 3rd person shooters in same game. I mean look at this video 3rd person almost definitely fits into this game.
http://www.youtube.com/watch?v=DKL_tDCMcRI
1. That guy's really bad at the game.
2. Everyone in the other team is even worse for letting him get away with it.
3. He plays it like a third-person shooter and only gets away with it BECAUSE the other team are being complete noobs.
If the other team were actually taking advantage of the SMART system's manual controls, and moving around well, that guy would be screwed. He NEEDS to learn to burst-fire, he NEEDS to learn to move faster, he wasn't running ANYWHERE, he svckS AT BRINK. But he's probably pretty good at third-person games.
If you get someone who's good at Transformers: War For Cybertron, and stick them in Brink in third-person, they'll wipe the floor with every player I saw in that video.