The Duff CEO with a Windows-Logo on his forehead: "Gamers use Windows because of its' user experience not our de facto monopoly."
Next Image: Duff CEO with Windows-Logo in front of a "Out of Business" sign. Subtitle: "30 minutes after SteamOS is released"
Edit: Yo, I'm not saying this is gonna happen. I just want to say that Windew's UX sucks ass.
It could be 99% of games and it wouldn't matter if the remaining 1% are what people actually wanna play. Support for games outside of Steam is beyond the capabilities of most PC users. Most people don't actually enjoy playing Troubleshooting Simulator.