I don't see PC gaming lasting all that much longer, the boundaries from before where consoles could only play games and not do "stuff" email, web etc have gone. Consoles are much cheaper, the range of games is similar or greater, the input devices more varied than they used to. It's only a matter of time 'til Crysis becomes a flash style game on the web that you run on your PS9 and laugh about the poor graphics, but we've got to roll with it.
On the forums here I'm pretty sure around half of the members who are into thier gaming have a console (360, ps3) as well as thier pc.