The linux desktop is a fart in the wind, linux is fucking everywhere. Even microsoft is a heavy linux 'customer'. What Valve has done does effectively decouple "PC Gaming" from "Windows Gaming", and that's a big deal. Apple is already using this tech to improve gaming support on OSX. One of the "dirty tricks" for a long time was controlling the gaming APIs rather than supporting standards. That grip is loosened a lot now. It could be loosened even more if more devs adopted Vulkan and used portable APIs rather than DX.I disagree. All hardware needs an OS that provides unanimity and supported by a single entity to keep pace with progress. Hence, why Windows, out of many other reasons, including MS's dirty bag of tricks relegated Linux to a fart in the wind.
The argument would be more appealing if we're talking Mac and iOS, but there is a reason Apple got curbstomped too. And MS is not going to force a transition without many prerequisites being in place (so as not to leave a nasty gaping whole ready to be exploited opportunistically by anyone - they're not that stupid). That doesn't stop them from thinking about how to do it and working towards this goal, bit by bit.
Those investing on MS dominated or dependent platforms (PC, Valve and Xbox) can't say they weren't warned.
Steam is able to "provide unanimity" and be one of those "single entities". It advances way more quickly than Xbox or Playstation front-end systems. Valve is better than anyone at this, to the chagrin of Tim Sweeney. They don't need linux to beat windows to do this. The goal isn't that you use SteamOS to edit video and write documents. It's a platform for gaming.