Hmm, I don't know about that. The world is full of pretty/beautiful girls. They can't all be models. Even one of the Sports Illustrated models admitted that once you get to a certain level in modeling, girls like her are a dime a dozen. And she said it's as much or more about luck and/or timing, as anything about looks, for one of them to get to "supermodel" status. And really, after the 80's/early 90's were done, that term lost all meaning anyway. Now it's like "MILF" in porn. It's just another word that gets applied to most any girl that is paid to stand in front of a camera or walk a runway.
People used to say that 80's superstar Danielle Martin was "too pretty for porn" and should have been a model. I think her response way back then was probably the same as a lot of the girls now: "Why? I like what I'm doing now." Plus the social stigma of porn and adult modeling now is a lot less severe than it was back in Danielle's day.