Wayland kinda is an x.org project in the first place. AFAIK it’s officially organised under freedesktop but the core devs are x.org people.
x.org as in the organisation and/or domain might not be needed any more, but the codebase is still maintained by exactly those Wayland devs for the sake of XWayland. Support for X11 clients isn’t going to go away any time soon. XWayland is also capable of running in rootfull mode and use X window managers, if there’s enough interest to continue the X.org distribution I would expect them to completely rip out the driver stack at some point and switch it over to an off the shelf minimum wayland compositor + XWayland. There’s people who are willing to maintain XWayland for compatibility’s sake, but all that old driver cruft, no way.