[pkmays]

Wayland can eventually fill the role on Linux perhaps. X11 is built to run on many more operating systems.

This is my main issue with Wayland. Whence portability?

[macavity23]

Very few apps call the X api directly. Nearly everything uses GTK or Qt, which they'll still be able to do, except that behind the scenes GTK/Qt will hook into Wayland on Linux and X elsewhere.

[wmf]

Wayland for other OSes can be paid for by users of those OSes.