The properly-sized MBP has never had a discrete GPU and I support any initiative that rids the world of the shameful notebook-gamer.
Sometimes you have to game on the rig you have. My 3,1 MBP was decent enough to play Valve's games and Starcraft (until they boosted the system reqs for HotS) since I maxed my RAM to 6GB and went with the best card option (8600GT I think.) It still holds its own, but for the three and a half years I was in college I didn't have the money or even the premises to consider upgrading to a dedicated desktop.
That was quick, praise be to Bobby Mansfield (SAW) for saving another soul.
Years ago I planned on building my own gaming rig when I had the coin, but now that I do I really can't see the advantages for me. Console gaming is a lot less headaches than dealing with Windows on another rig or Boot Camp. I am going to buy myself an old Classic machine at some point just so I can be sure I'll have my old 90's Mac games forever. I get a kick of thinking about having my kids play them and what they'll think.
Long live Spectre