Is this you volunteering to do the port? I'm guessing you're not going to learn how to do this new thing. The real irony here is that they are actually implementing your suggestion - they're potentially going to hire some random 22yo who's response to porting XMonad to Wayland is "hell yeah!". Although realistically they'll probably get someone a bit more experienced.

They don't seem to be saying they can't do this or that it is some insurmountable technical challenge. They're saying that they aren't going to do it themselves and aren't giving reasons.