I really, truly suspect Wayland is the future
We have had like one hundred X11 replacements between 1990 and now, and at least half a dozen have caught on with the open source community
What makes Wayland different is that it has attracted multiple vendors supporting it. Most notably IBM/Redhat, Intel, AMD, and, to a lesser extent, nVidia.
I am posting this message from an X11 environment, because I need X11 for a lot of things, home and work both, but, I can at least imagine a world where Wayland is the new default. That is not something I could say about the last hundred attempts to replace X11.
Edit: Again, this is just a suspicion. A notion. I neither hope for Wayland's success nor failure. I just keep my finger to the wind.