In my opinion this is the last generation that the PC will enjoy many major exclusives.
Next generation when all consoles have large harddrives and motion controls that rival the keyboard and mouse in terms of ease of control we'll see a situation much the same as the Wii has now with the PS3 and 360. Despite the graphic superiority of the PC even more gamers will go to consoles because the differences will be even less than they are this generation (especially when gamepads are no longer part of the mix).
I expect next generation is when MMORPG, Strategy, WRPG, and any other remaining genres currently dominated by PC will follow the same route FPSs did this and last generation.
Of course the line between console and PC will likely become even more blurred and it could be that what it means to be a console or a PC may change as well.
