My immediate reaction was "Why are you killing Windows, Microsoft?". From that moment I installed the beta I could see the destruction of PC gaming and everything that came along with it following in it's wake as clear as day.
A lot of people misinterpreted Gabe Newell's dislike of Windows 8. People seemed to think that he disliked it simply because of the windows app store. Just because it might compete with Steam. The problem is much more fundamental than being competed with. He disliked it because it's a terrible release of Windows that destroys the very platform Steam is on.
It's no wonder Gabe decided to go all in on Linux. It may be a slim hope getting that to stick, but at least it's a chance. If the platform you rely on is going to self destruct out from under you, you need to jump to whatever has a chance of keeping you afloat.