Please see one of my other replies here. When implementing an X11 compositor those parts were already done separately anyway, and this is actually the entire point of X11 compositing. So the trend with X11 was already going away from the direction that you suggest.
There is a remote possibility that some person comes along and builds a server and library that will work for everybody. But such things would probably be very large, much larger than systemd. Actually, the closest thing to what you describe is probably a web browser and HTML5, but building a desktop on that seems to be not popular aside from Chrome OS.
There is a remote possibility that some person comes along and builds a server and library that will work for everybody. But such things would probably be very large, much larger than systemd. Actually, the closest thing to what you describe is probably a web browser and HTML5, but building a desktop on that seems to be not popular aside from Chrome OS.