Change & transformation never stops - this is just reality of existence. I'm not sure what your point or question is - can u be more specific?
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My point is that development of any software should eventually taper off once it matures. More complex software takes longer to mature. X works fine on many systems and needs few changes. If Wayland matures, it will be in the same position.
As for rationale, I can see applications for Wayland on embedded systems where memory is a premium, but I don't think it makes much difference for most systems people consider to be computers. SGI workstations from the 1980s ran X windows without problems. If computers from the 1980s could run it, then ours should have no problems running it. After all, our computers are many times faster.