In the article linked, they also state that the Source engine's coming to linux. If that's the case, they're going to have the source games available pretty shortly... the source article is two years old... I bet it's done and now they're cranking up the delivery system to move half-life, counterstrike, etc to linux. If they see a quick uptake on the linux clients for those games, I bet other games will quickly follow.
I'd also perhaps look to them partnering with someone to deliver a linux based console; boom-headshot to being them being pushed around by the owners of the proprietary consoles currently extant. It's good strategic planning to make sure they don't end up as simply a Jobs' auxiliary software vendor.
I mean, if you could get a 300 dollar linux console that played half-life, doom3 and descendents, and counter-strike, as well as letting you do all that internetty goodness and movies-on-demand, would you get one?