Because wayland is 'ready' when X can be properly killed, i.e. wayland is working for essentially all users. As it stands a huge fraction of users have issues with it, because most users have at least one 'pet feature' which they are not willing to give up.

As far as I'm concerned, a technology being "ready" (for mainstream adoption or whatever) means that it works better than or equally well as what it's replacing for most people and at least "well enough" for a significant majority. As far as I can tell, we've been there for a while with Wayland. The vast majority of people don't have to care that they're on Wayland.

X doesn't work for essentially all users. It works for substantially fewer users than Wayland does. There are several features that X is missing, and you might call them "pet features" but they are features that the vast majority of graphical desktop users expect these days.

That's quite the claim; maybe you operate in different circles than I do, but most power users I know still avoid Wayland like the plague. X doesn't have support most of the modern fancy features, yes. But on older hardware, which people with less money usually have, X works.

People with less money don't have old computers. They have Chromebooks, which use Wayland.

X still works great for me. I figure I'll give Wayland a try after another decade or so.