SteamOS was a reaction to Windows App Store. If MS wants to take away from their market share, they would push Linux as preferred platform. I don't really see this happening, so it remains a pipe dream.
We can at least hope Vulcan adoption will ease the effort of porting AAA titles to Linux.
MS has actually already started to flag users not to install software from outside of the Windows store for "security reasons", in the latest Win10 updates. We still don't know how far they want to go with that idea.
Within 3 years, the Windows "Home" and "Cloud"[0] editions will be unable to install applications that are not from the store. Not even with a registry hack. Anyone wanting non-store applications will be forced to the "Pro" edition.
[0] - https://betanews.com/2017/02/09/windows-10-cloud-hacked-to-r...
In fact, it looks like they just recently hired someone to work on the Linux display stack:
https://www.phoronix.com/scan.php?page=news_item&px=Valve-Hi...
I believe they also hired someone to work explicitly on the AMD drivers as well, but I could be wrong.
- 2x as many as AMD employs
- ∞x as many as NVidia employsBut you must've understood that.
But for all their sins, we have many AAA games on Linux now.
The reason you've not seen everybody and their brother come over is simple. They have games they want to play that don't work in Linux. Old rubbish like LoL, WoW and GTAV (which nearly didn't get a Windows version) is very sticky but the developers won't throw money at porting it. Hopefully their next iterations will be a little more open to cross platform support from the ground up.