As far as new worlds go, a lot of people like clean slates, fresh beginnings. Even if it's only the fact that they're user id says they've been in since the beginning and their team history shows them as the only owner. Right, wrong, or indifferent, many people feel this way.
I think as a long term solution, one possibility is to develop an engine that allows teams to be run by the sim. I know many have said they're against it, but if it could be developed well enough to satisfy most, I think it's worth looking into. Although it's a different dynamic than HD, I think it could work.
I started a new world a season ago because I wanted to try a world that prohibited trading. I thought about the rules for about a year, contacted admin, recruited folks, and got it up and running. I know it doesn't appeal to everyone, and I was ready for the fact that some would try it and not enjoy it. But we've just begun regular season games in season 2, and it's going well so far.
But, you're right, an ever-increasing supply of teams and a seemingly limited amount of demand from owners becomes a problem. Perhaps WifS is marketing it hard enough that they anticipate many more users coming to HBD.
