Normally projects like this address real needs. If X would actually fail to provide crucial functionality on modern desktop someone would develop alternative that would cover it and people would switch in a matter or years. Instead Wayland set out to build something complex and useless for most people and now is surprised it takes a lot of time for it to gain traction.
How it should be approached is that if people need some very specific setup (like multiple displays with fractional scaling and different refresh rates and they want to play games on it and need to get 100% of their configuration) Wayland should provide them a tool to do just that with dedicated server and DE. Most people wouldn’t need any of this and would stay with X, few people would use the new DE. If more and more people would require the functionality provided by the new DE it would grow, get forked and other DE would start supporting the standard. The approach of “we build something 1% of users need, spend a lot of effort to support us” is what’s silly.