X11 desktop environments are dying, but it doesn't mean that X11 is dead. XWayland is still a thing so you can still run your X11 apps on Gnome.
The big reason why I want to keep X11 besides backwards compatibility is the ability to run GUI apps remotely, even from a server that has zero graphical capabilities. But these do not really apply to desktop environments. If you want to remote a full desktop rather than individual applications, there are better options (VNC, RDP, ...).
I think waypipe should generally do what you want, though TBH so far when I need to run a remote GUI app, I just have them display to XWayland out of habit.
The big reason why I want to keep X11 besides backwards compatibility is the ability to run GUI apps remotely, even from a server that has zero graphical capabilities. But these do not really apply to desktop environments. If you want to remote a full desktop rather than individual applications, there are better options (VNC, RDP, ...).