You don't see me working on this stuff, but people keep complaining about this because instead of one thing that works but is a pain, we have two things that work but are a pain. It's pretty obvious that while Xorg works for a lot of people, it's not the way forward; but I think it's apparent that Wayland might not be either... although I think it's likely some will end up running a wayland server with Xwayland as the single wayland client to get continuing driver support.

This is a lot different than say OSS vs ALSA. OSS really could have worked (and still does on FreeBSD afaik), but ALSA fully replaced OSS. I think pipewire seems likely to replace PulseAudio, even if it may not have PulseAudio's key functionality of ruining audio when things used to work just fine.