no, it's not that they would quit being a PC gamer, it's that they would pick up a Wii to go with their PC. Most of the 360 games are on PC, so getting a 360 and keep upgrading your PC wouldn't make sense unless you really wanted a few games like Halo and Blue Dragon.
I don't agree with this article because 360 would make much more sense to replace a PC then the PS3 would.
currently playing: Skyward Sword, Mario Sunshine, Xenoblade Chronicles X