Many of the people that maintain X are the same people working on Wayland implementations. They're pushing people towards the new thing because it makes their lives easier, and that's also the nature of engineer driven product development, it's not going to consider all the edge cases underserved from replacing legacy software because there's nobody to keep them in check.
Edit: Guess the thought police decided my factual information isn't welcome here because it goes against their feefees.
Yeah, there's maintenance and security patching, otherwise distros wouldn't be packaging it...