Just something to consider about the way the DC and Marvel games are run:
Right now players have to choose existing, published characters in the respective worlds to play in the RPGs, and that's cool, if that's what you're into, but it totally excludes players, like myself for example, who love the DC universe or the Marvel Universe, but who refuse to play published characters.
Now I know what you're thinking - give someone the okay go to create a character and they will just rip off whatever their favorite character is in the universe. And yes, there may be some of that. But isn't that what the approval process for characters is for in the first place? To tell the truth, I don't think that should be a tremendous concern anyway, because people who want to create their own characters to play in the universe will want to do exactly that - create their own characters. They're not interested in ripping off existing super heroes.
As for putting a two or three season cap on how long you can play an existing character, that's all well and good, but it essentially means that people looking to join the RPGs now end up with this overall message:
You cannot create a character of your own, so you have to pick an existing character from the world. Unfortunately, all the ones you have any interest in writing for are taken, so you can:
A. Wait around until we get to a new season (whenever that may be, we're not exactly sure ourselves) and hope that a character you want to play is free, OR
B. Find another RPG somewhere else on the Web that will either have an existing character free or allow you to create your own character that fits well into the world.
Do you see what I'm getting at here? B renders a much more immediate result, but unfortunately means that prospective players are finding somewhere else to go.