Yeah i'm just going to write off the 210-odd games i've already got on steam to move to linux....or not lol.
You will still be able to play your old games on Windows, future games being optimized for Linux and having better performance out of your hardware is a good thing. People don't like change, computer people really really don't like change lol. I see ValveOS as a great thing personally. Why should Windows be the only way to play PC games. Look forward to trying ValveOS out. W7 for work stuff, ValveOS for gaming.