I would keep your hopes up honestly, USC is STILL accepting applications until the 15th and some people haven't heard from there, and frankly if you're going to spend the $150k some people want the 'usc' name behind the degree so they may change their mind. HOWEVER ha the office of admissions said they're expecting 500 applicants this year so they're letting people know by mid-march.
ALSO Dominican in San Rafael hasn't sent admission notices either they're accepting apps until march I believe so you actually have a great shot just hang in there.
What were your stats btw?
I would guess you have a good shot at number 4 on the waitlist. During the interview day I know a few people told me they had other schools to choose from. This Monday is the deadline to pay our deposit before they start taking people from the waitlist so you might see movement soon.