I'd love to see one pop up. Not as part of something else, but, like, its own super-kayfabe world, where wrestling is the most important sport - and possibly the most important THING - on the planet, and the feuds and larger than life characters are all real. Even the supernatural ones. I CRAAAVE it.
I'd also definitely love to see Street Fighter/KoF or Mortal Kombat games, but I'd be more interested in freeform RP in those than, like, throwing numbers at each other. I think the characters are the most interesting parts of those games anyway, and certainly the best part you can get across in a text game. I didn't like MoTM's HUGE CROSSOVER though, it seemed unfocused, and a lot of the series didn't mesh well. The only think I'd consider allowing to cross over would be Street Fighter and King of Fighters/SNK since they're pretty similar anyway. I'd still rather keep things condensed so characters can have their supporting casts around and everything.
A Guilty Gear game would also be rad.
But yeah, pro wrestling is what I'm about right now.