Those rules would mean that there would be about four or five playerworlds online
Doomsday, for example, gets about 45 people at its peak time - however, unlike some playerworlds, it keeps its peak time for 5-6 hours, and even when most playerworlds struggle to get 10 players, Doomsday has at least 10, sometimes even more than popular places like N-Pulse and UN (and sometimes Graal2001)
entravial, does your suggestion that a playerworld that is consititently populated (for at least 20 hours a day) should be taken offline?
Also, in regard to UC playerworlds - can't you make some sort of example world? I remember when we were redoing Doomsday's overworld, and we created a preview world, with a few heart quests and such - it kept players satisfied until we were able to fully release the new levels. Can't you make a place with a few things to do, a few quests, just enough to keep people happy until the full playerworld is released?