Wayland is why Steam Deck is a product. Gamescope, the compositor it uses for all the features that makes it compelling to buy, uses it and it's features heavily.

Desktop Linux was never going to go anywhere stuck on X. Wayland is happening, it's currently going through it's trial by fire and in the end (and for a lot of people, right now) it'll be better for it.

It's easy to say Wayland has been around forever and barely progressed, but for me it's pretty easy to see, based on the massive amount of fixed issues and new features being added to Wayland, that we're no longer on the horizontal part of the curve. It seems a lot of people have become blind to it's exponential growth. Also the growth of desktop Linux adoption, which is real and happening, in spite of 'Wayland setting Linux Desktop back by 10 years'.