Here's the thing about Xwayland: Xwayland is Xorg. If you look in the xorg code base, you will find that it's separated into components called DDX and DIX. DIX (Device-Independent X) handles protocol and server state; DDX (Device-Dependent X) does the drawing. One of the back ends in the DDX code is for Wayland; when you compile Xorg with just this back end, you get Xwayland.
So if Xorg gets abandoned -- oops! There goes Xwayland as well. I do believe that this was the plan all along: keep Xwayland around as a solution for "legacy applications" for a while, then stop supporting X altogether to make it less attractive as a back end for new applications and toolkits.
Yes, I am familiar with the Xorg code base :) The point I was getting at is that if you want to keep using an old protocol far into the future, someone from the community has to step up and maintain something. That's true of any old technology faced with waning influence over time.
So if Xorg gets abandoned -- oops! There goes Xwayland as well. I do believe that this was the plan all along: keep Xwayland around as a solution for "legacy applications" for a while, then stop supporting X altogether to make it less attractive as a back end for new applications and toolkits.