Wayland can never be an adequate replacement for X11R6, despite its stated purpose, because its design fundamentally chases specifying a protocol for heterogeneous implementations of, what I suspect to be one thing: Apple's WindowServer. In specifying Wayland, focusing on compositing, while expecting major projects already committed to standards built atop the X Window System like XDND, ICCCM, et cetera, to band together to do the same for Wayland a priori, clearly hasn't worked out for reasons that seem self-evident to me. If there was one single dominant ecosystem of desktop environmens built on one dominant UI toolkit from which all others sprung, sure, this could work, but this is simply not the reality. On top of this, with the realities of the second-system problem, it seems clear to me the Wayland steering committee set out on an impossible task.

But man, with a few million bucks, a couple years development time, and a small, dedicated team, maybe somebody out there could make their own little slice of heaven.