Depends who pushes it and how - Steam (Valve) have the clout to if not to "take over gaming" at least turn it into a duopoly on the desktop/laptop from an OS point (from a game client point of view there is already Steam.....and way....over here everyone else).

I don't think anyone else does.

There isn't any technical reasons preventing it, PS5's are based on a heavily modified BSD - it requires a single vendor to standardise and support the platform with enough resources/commitment to do it properly.