Is there anything to admit, though? X.org has been in the so called "maintenance mode" for years and any development on the current main project is dead in its tracks, this is a well known fact. But no "drop in" replacement exists as of now, nor in the foreseeable future it seems there will be one - Wayland is an alternative, if you limit yourself to anything that is properly supported, with fundamental design differences (necessary for a more "modern", efficient approach to the current technologies), but I personally can't but think it's dead on arrival. There was some quote from the original developers of X.org about only few people in the world being able to grasp it in its entirety and I believe it's gotta be true.