There are a lot of games that are not on PC, and some of them are really good:
Uncharted 2, Red Dead Redemption, Dragon's Dogma, Demon's Souls, Marios, Zeldas, Forza Horizon, Persona 4 Golden, Last of Us, Journey, Vanquish, MGS, etc, etc...
And there are other games that you have to wait years for a port:
Fez, Spelunky HD, Trials Evolution, Dark Souls, etc.
For me it's about the games. I just checked the list of upcoming games on this site: more than half of them are not on PC. That's why I think I need PC and consoles.