I'm a Wayland evangelist and super sad about the fragmentation - it's the main thing holding it back right now. KDE and GNOME are both doing their own thing, with the wlroots (Sway) community being the main driver for standardization: Wlroots protocols are slowly being integrated into Wayland proper and implemented by KDE (layer-shell is coming up).

I would hope the Freedesktop group to get active here, as they have been incredibly successful promoting standards in the past and probably could do it again - but it seems like they're closely associated with the Gnome-Project, which has apparently decided to go the "fuck everyone else" route.