Probably never. I've even put off PC gaming in favor of the PS3 (and I used to be a huge PC gaming fanatic). I'll put the money that I would have spent on an XBox360, PC upgrades, and XBox Live towards more PS2/PS3 games (I love the 60 GB PS3, greatest console ever created IMO). Not to mention that other than the big PC games, multiplayer is mostly dead for other games on the PC. There was only one R6: Vegas server for the PC last time I checked. Part of that is due to the horrible way multiplayer was handled on the PC, but still, it's disappointing.
The PS3 offers more than enough games for me personally. Right now, I'm working on Odin Sphere (PS2) and Rainbow 6: Vegas 2 (PS3). And I've still got a huge backlog of games for both the PS2 and PS3 that I want to play, but haven't had time to get around to. And then there's GTA4 (I could care less about DLC) coming out later this month which will probably be a big timesink. Along with GT5 Prologue, I'll probably be set until MGS4 comes out. And if they don't last, well I still haven't gotten around to picking up Uncharted or Ratchet and Clank. Not to mention that I've only just gotten around to getting some games for my PSP. Currently playing MGS:PO, and looking forward to picking up FF7: Crisis Core.
The only non-PS3/PSP game I'll probably pick up in the foreseeable future is Mass Effect (for my aging computer). Other than that, PS3/PSP all the way.