In Plasma 6.8, there will be no X11 session in the login screen. There will only be a Wayland session available to log into.
In 6.8, all X11-specific code paths in Plasma for Plasma Shell, System Settings, and device configuration will be gone.
This means that the next distribution releases (Fedora 45, Ubuntu 26.10, and Debian 14 in 2027) will ship KDE plasma with only Wayland.
Our internal metrics within KDE show that over 95% of users of Plasma 6.6 are on Wayland, with a gradual increase every release. The metrics also show that basically no one is testing or developing Plasma on X11 anymore. The platform was already, for all intents and purposes, abandoned by KDE contributors.
This number is most likely sampled by the opt-in telemetry and crash reporting diagnostics. So it could not include those on older plasma releases with X11 or have switched to another desktop for X11.
What do you think? GNOME has already removed X11 from GNOME 50 this year and now KDE is following not that far behind. 
I've been using Bazzite which ripped out x11 a while ago in anticipation of this, so I'm unaffected. If developers want to move to a new protocol that isn't held down by decades of tech debt, then great. There are a few situations I've seen of people having legitimate issues with Wayland missing features, which will be solved in time, and a whole lot more people complaining for the sake of it to the point of using an x11 fork made by a fascist.
The x11 fork guy also isnt an x11 fork he just made x12.
Removing X11 is a net good since it'll force everyone to a new status quo of sorts and leave all the chuds in the dust.