To nitpick, it’s really Steam Play (Proton) + Lutris (for games not available in Steam) + Wine that have already fixed gaming on Linux. With those three you can play ~90% of games now. The Steam app is already widely in use, but it remains to be seen how successful Steam Deck will be.

And Linux Desktop is already here, it’s just not evenly distributed. Lots of innovators and early adopters, aka the cool kids, are now on Linux Desktop, including for gaming thanks to the above. It’s only a matter of time till the mainstream and late adopters follow.