It's an outdated concept, you could still have a hot ring girl, but just change her role. Basically, combine the jobs of a ring girl, Bruce Buffer and maybe Megan Olivi - have her be like a ring MC. Be hot and announce the fights, maybe interview fighters post fight as well.
Cause this current ring girl stuff is kind of flat and sad. Bruce Buffer is horrible anyway and, besides Bisping, nobody's good at post fight interviews. Find some hot chick with a great voice and media skills and give her the job. Or have two - each one announcing her own corner, and gets the interview if one of her guys wins. That way you'd have an already built in competition on top of everything (Team Susan vs Team Jessica) and could give bookies another thing to bet on.