The problem with new worlds is that they dilute the pool of players even further. A lot of worlds have long wait times between seasons as it is. Adding new worlds adds to the wait time (for most). It's a novelty, being in a new world, but it wears off quickly. If you are looking for one, watch the classifieds and look for new "theme" based leagues. My personal hope, however, is that there are no new worlds started until the average wait times decrease. There was a flurry of new worlds about 12-18 months ago; I'd be surprised to see many more in the near future.