> And furthermore, I do not believe that that there has been significant court ruling saying that discrimination in favor of wealthy people, would be equivalent to discrimination on the grounds of "Race, color, or nation origin", if you are going to make that argument.

You're correct that this is essentially the argument I'm proposing (although you could broaden 'wealth' to a wider range of racially influenced factors of educational success/access). It might not have been made before - Yale may try to make it.