> I hope that I'm not discriminating against social
  > anxiety but I spent 5 years in toastmaster's
  > throwing myself in uncomfortable situations
  > until I could come out of it.

That is impressive and I believe you, however I don't think exposure therapy is proven to work in all cases for everybody. Either way, I don't think that we should require everybody to have 5 years of practice in whiteboard interviews before they can get a job. That can't be right.

  > Maybe I'm alone in my thoughts but I'm looking
  > for people who will grow.

Perhaps they would like to choose what they spend their time on. Sometimes introverts don't mind being introverted, and don't want to take courses on "how to be the most exciting guy in the room". They like their personality as it is. They might still push themselves to grow, but they choose to grow in the areas that they care about.