I don't think chrome OS will be a viable gaming OS. Especially if ati or nvidia choose not to support it.
Maybe not as is....... no...... But if you watch the video on you tube they said any app that is on the net will work. Now this might be steam up your ass of course. But it might not be either. Also if Win 7 fails ATI and Nvidia might have no other choice but to jump ship. Especially if the buisness sector drops Microsoft because of failure to deliver. Sure if that happens they have a lot of other options like...... Mac OS, Linux, among others. But because Google is already well non as well as so large and everyone already knows how to use it.
You never know it might go over like gang buster's. But again they said it can already use an App on the net. All that would have to happen is a code writer get board and start writing.
But I also am not that well versed in the way OS's are written and made. So I could be missing another picture here too.