You're not getting X12. This is exactly the kind of "gives false hope for no reason" stuff the Xorg maintainers were talking about in relation to Enrico's work. This guy's just unhinged and thinks he alone can solve what a team of people who have worked on that project for years and years can't. And he's literally just breaking things in the process, as explained by the Xorg maintainers that it's a fragile codebase and you can't just easily rework code, and that's why it's better to start fresh. And because of his stubborn and reckless approach he's caused a major regression which would have affected Xwayland too, which is the maintained side of the project. So, he had to take his toys and go elsewhere.

Xorg's demise has nothing to do with RedHat and everything to do with the fact that it's a buggy mess held together by hopes and dreams, built on an antiquated design pattern. It could have modern features, if only it had a completely different codebase, and nobody wanted to go through the extremely excruciating and lengthy process of rewriting the xorg codebase just to end up still preserving the antiquated design pattern it's based on.

Like that's it. Anything else is not just opinion, it's delusion. New standards emerge all the time for any piece of software, and sometimes it's just time to move on. Depending on how the project is handled, in 2-3 decades Wayland too might start to show its age, might be unable to handle new design paradigms and feature expectations and might end up being phased out, and that's alright. It's just how the lifecycle of software goes.