By the time GTK5 arrives Wayland will probably be old enough to drive or maybe even drink in the US. And, as much as I hate to say it, I believe it will still not be omnipresent in the Linux desktop.
I really want to see Wayland move forward and succeed, but there are so few companies injecting money on it, they get to dictate how things move. Red Hat is one of the main contributors, and they only seem to care about Gnome working on Wayland (as much as I don't like their direction, I can't really blame them for following it, it just sucks that I don't like the product they're developing). The landscape is extremely fragmented and everybody who is not on the Gnome garden will suffer a lot.
I really wish some other non-Gnome-favoring company would find a reason to dump a lot more money into Wayland and help move it forward in the not-only-gnome-favorable path. This is not a thing that will move forward without full-time workers. X has always had a lot of paid people contributing to it.
That is, if IBM doesn't decide to throw a bigger wrench at the problem.
What about all the portals built by Redhat that allow kde and wlroots to tap into screen recording, audio, and soon even key captures? I get that Redhat doesn't actively submit patches to wlroots, but they also seem to be making stuff as open as seems reasonable.
As a Sway user, I haven't noticed anything that works on Gnome but not Sway, except for stuff like Zoom, which hasn't, until recently, used the portals.
xdg-desktop-portal itself originates from Flatpak[3], which makes me think it's more like to related to Canonical/Ubuntu rather than being something RH drove.
[1] https://github.com/emersion/xdg-desktop-portal-wlr https://news.ycombinator.com/item?id=32008412 (2 pts, 30 min ago)