If X isn't actively developed anymore, it's because wayland has sucked up the remaining developer resources I guess. Apart from a very brief episode in late 90's I'm not into X development so I'm not in a position to have an opinion, but I'm having trouble with "the way forward" argument, considering we're already long past peak-desktop. I'm more concerned with the precious few desktop apps we have (towards which there were nearly no additions in the past decade) and loss of niche apps due to additional Wayland porting, integration, QA efforts put on developers of said apps, which realistically might spell the end for many extant desktop apps.