Huh? Since Gamers are only a tiny fraction of the PC User space that statement makes zero sense. Linux on the Desktop is dead because most of it's common apps either suck, or are already available (with a much better UI) on Windows/Mac.
Don't underestimate the 'halo' effect (not Halo, though it may also apply) that games have on a platform. Much of MS Windows' early success and dominance was a result of having many more games available than Mac OS.