Now that the laptops are out, it is entirely viable to buy a gaming laptop!

(Woohoo!)
But it is still extremely expensive, and for college etc. for most people, it is still the best option to get something like a mini ITX desktop PC and a workstation laptop, as it is FAR better value.
Also @StoneColdSteve, how could you expect him to show up if he didn't have a laptop?
People own stuff for their own personal use, and if he's not on the move frequently, it seems obvious he wouldn't have a great gaming laptop.

Personally though, i'm not sure in what situation you could viably game on the go with a gaming laptop though.
I mean for a good experience you'd have to lug around a thick laptop with a mouse and mousemat, and additionally the battery doesn't last long, and the thermals are poor in most cases.
Only application I can see is frequent international travel.