I see plenty of white suburban kids at the U. My job is to help mostly suburban kids with college apps. I have never seen a kid shy away from urban schools but rather the opposite, in my experience they don't like rural schools. There are some exceptions, Penn, Yale, USC, University of Chicago are in rather tough neighborhoods and this is a consideration but it is for all students with whom I work. But schools like UCLA, Berkeley, UC San Diego, Washington, George Washington, Boston University, MIT, Harvard, Northeastern, Tulane, NYU etc. have no shortage of students seeking admission despite being in big cities.