"running on any living room machine" ??
I have about 50 games on Steam and they run ONLY on windows so what do they mean?
Any living room machine running on an Intel CPU with Windows 8 as first layer?
Or, buy your games again on a new platform?
There are nearly 500 games on Steam that run on Linux now. While that's still a small % of the total number of games Steam offers, many of those near 500 are pretty big names (TF2, L4D2, etc.).
I've not yet had to pay one thin dime to snag the Linux version of any previously purchased Windows only game now offered by Steam for Linux, but YMMV.
I still primarily use Windows for gaming, but Steam for Linux is really improving at a rapid pace. That being said, I give it about a 50% chance at sticking around on the long term solely because Windows comes on pretty much every PC built and Linux is still a niche OS as a whole (still under 2% or so market share in the desktop space).