Juilliard Is A Waste Of Time (Unless You’re Talentless)?

According to the trivia section of Robin Williams’ biography on IMDB.com:

(Robin) Studied acting briefly at Juilliard under John Houseman. Houseman told him he was wasting his talent at Juilliard and he should strike out on his own and do stand-up comedy.

This dumbfounds me. (Not that it’s difficult to “find me dumb,” but that’s another topic. :-p ) What, is Juilliard for people who don’t want to be performing artists? Is Juilliard for people who don’t have talent. (Well, we are talking Robin Williams…. ;) ) What was Houseman saying about Juilliard and its students?

I wonder how many graduates of Juilliard have Oscars, and what the ratio is to the overall number of people who’ve attended.