I find this interesting as well. The lower level stuff is understood by a few guys, and it seems old – but they might just have an image problem; I think I have read in a few recent interviews with the developers that X.Org is in good shape.
Personally I would love to see a minimalistic replacement, and I have followed the Wayland development for some time. Since the computer is almost never used without a web browser, I’d like to see the web browser engine run in fullscreen and have all applications – including the system that organizes the applications and the terminal implemented by using web technologies. This is slightly bit off-topic, but my point is that we may never see another generation of “X.Org + window manager + GTK/QT + applications built on these toolkits”-like architecture built from scratch ever again. -- Best regards, Alexander Teinum