<p>Interesting point. However, at USC, you have to apply to individual professional schools.
Just because someone is accepted to the College of Letters, Arts and Sciences (general acceptance), is no guarantee that you will be able to transfer to one of the professional schools. It is true that some freshmen change their majors but there is no guarantee that you will be able to change your major to a specific, highly competitive program (such as the Cinema school). I sense it would be fairly easy to change some majors (such as switching from History to Political Science or English), but transferring from a Social Sciences/Humanities major to Cinema, Annenberg or Viterbi Engineering is more involved and not guaranteed.</p>