There is a SPICE backend: https://github.com/ein-shved/compositor-spice
There is the Samsung effort Wayland Over Wire (WOW): https://blogs.s-osg.org/wow-wayland-over-wire/
Apparantly, the Pipewire effort to make a high performance, low latency audio/video server will address remote display somehow too: https://blogs.gnome.org/uraeus/2017/06/20/fedora-workstation...