I don't think it's a good idea just because it would take away too much money from the game. Stefan makes the majority of his income from playerworlds, not player accounts. Or atleast half.. ;x
The reason most people like graal is because it's developed and run by the players, for the most part it is anyway. Taking the ability to make your own playerworld away, no matter how crappy, would take away from it's spark imo.
Some players might not be as talented or creative, but it takes time to learn. There really is no other way to learn to script other than buying a server so unless Stefan plans on making a gs2 editor, that would actually slim down the number of new developers aswell.
Maybe the PWAs could give server stars to rate how good they are based on content already developed and the future plans that they have for the server. Aswell as maybe telling what they already have done. Obviously, there are way too many playerworlds to get to them all, and some (the bad) servers might not agree to it. But at the owner's request they could inspect the server every, say 6 months.
It would help developers choose which servers to work for so they aren't just wasting their time with some dead end project and could instead work on a well thought out one with other good developers.
Though I guess it shouldn't be that hard for you to figure out if it's going to be a waste of time or not for yourself.