What?? I've been using a GeForce 560ti for going on 3 years now and it has run every game at 1920x1080 at max settings. This isn't the early 2000s where PC users had to upgrade their cards every year. Using my current hard drives, tower, and monitors I can easily build a much better PC for $1000 that would beat out the PS4 and Xbox1.
Obviously some game graphics are about to take a jump since most developers have been catering to the Xbox/PS3 and the PC versions couldn't have better visuals unlocked without modding (Dark Souls, Skyrim, etc) - but PCs have been able to do what the PS4/Xbox1 are able to do for atleast 2 years now.
I'll still be buying a PS4 for the exclusives (Final Fantasy, Tales of..., etc) but I see no reason otherwise with it's current non-exclusive launch lineup.