There are many ways of achieving the same result. Quantity proved to be the most effective one for the most of the times. You cannot expect a newbie mapper to make a decent map, but I am more than sure that most of the newbie mappers will start from some crazy trigger mess, to compensate their low skills by some novelty in the map. Widening their abilities will increase the amount of mappers and their willingness to create maps, and hence increase the amount of skilled mappers in the future.
I am in no doubt that you will be able to stand a few more newbie maps in the hopes that soon their authors will get the skills required. A good example of that will be brain and face.
Moreover, I am personally tired of the maps without tweaks. Ok, it can look good, play good, but after 500-5000 games you just repeat yourself, always, and just a new map takes 5-10 games to kill all the exitment you get from it. Yes, my attention span is THAT short, it should really take much shorter to get bored.