I'd like to take maintainership but... only when 1.21.0 is released which may never happen. Given no known working compositor uses this port let's avoid spreading QA too thin. For example, xf86-video-intel gave up on tracking releases years ago.
Fedora 34 plans to use development snapshot(s). Once released xserver may have fewer (if any) hw/xwayland changes in 1.20.*, leaving server-1.20-branch mainly for hw/xfree86 (bare metal). So, my current proposal is to add the following:
DEPRECATED= Upstream no longer maintains Xwayland on stable branches, use x11-servers/xwayland-devel instead
 kwin_wayland isn't usable yet, see https://forums.freebsd.org/threads/wayland-plasma-5-16-1-error-no-libinput.71271/
(In reply to Jan Beich from comment #0)
> I'd like to take maintainership but... only when 1.21.0 is released
To be accurate, I was planning to throw everything away and start form current -devel port. Having xwayland depend on xorg-server, a dumping ground for non-upstreamable patches, lots of cruft, autotools, non-declarative style and users ready to crucify you, is not fun.
See also https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/582
Let's just wait a bit to see what will happened on the freedesktop proposal.
So for now let's keep things how they are.
If nothing is happening upstream before 2020Q2 we can think of splitting xwayland from the master ports and updating it to what's in git at this point.
I see no point of deprecating it now.