First, the FPS genre will never crash the way the music genre and Tony Hawk genre beforehand. It has too long of an entrenched history first becoming a phenomenon in PC gaming, then again with consoles beginning with Goldeneye for the Nintendo 64 (some would say Halo, but they don't know what the hell they are talking about and need a history lesson).
If the FPS genre crashes on consoles, it will be a major boost to PC gaming as the FPS genre and developers who made their rep off of it will flee to develop them for PC gaming.
The genre that will benefit the most is the duck and cover, 3rd person shooter genre. Currently, Gears of War and games like it are palatable substitutes for FPS games. I would say action-adventure, but Gears of War and duck and cover, 3rd person shooters are included in that wide genre.
