They could try looking for actual diversity, then, instead of just an aesthetically pleasing mixture of superficial skin colors. Accepting 100 multiracial kids who all attended the same boarding schools is going to be way less diverse than a selection of 100 kids from different levels of income. Actually, I believe income quite dominates race in terms of predicting academic success these days--the interracial achievement gap looks quite small by comparison. (As well it should, in a country currently headed by a black president.)