I think what he meant--he can correct me--is that the studios should be scouting schools for talent. But they already do that; one of my friends, a computer animator, was "scouted" (and turned them down). It happens all the time, and the results are on the screen.
I think what some want is for Hollywood to bring in more conservative talent, but you can bring a horse to water but etc. etc. etc. No one's keeping conservatives out; conservatives aren't going. (For the most part; I know some who are, and they're doing ok.)
Conservatives tend to be more well-balanced and risk averse than the arts require. What conservative would raise $200 million and invest it in a very long strip of plastic with pictures on it? What conservative would enter a profession where 99.999% of its practitioners are out of work at any given time?
At the same time, "stars" come from odd places. Brando was from Nebraska. Borgart (everyone's favorite every man) grew well off up on Park Avenue in NYC surrounded by artists etc. Nicholson was from a working class family in south Jersey (believing his mother was his sister. Yikes!)