I think a wide range of settings are already around. I've been part of plenty of different genres in my time here and I don't think variety is an issue. Even stuff I have no interest in, such as historical or western settings, crop up from time to time.
I guess Persona is something I didn't get a chance to properly play, considering the only one I've been a part of was kind of a mess and didn't last too long. I'm always up for more card-game stuff too, but that's been super volatile for as long as I've been around.
Stuff like this comes and goes with the times, anyway. It's pretty random when any given setting will crop up, so taking matters into your own hands or getting a friend who's willing to GM would prolly be the best bet to playing something with any degree of certainty.