They always leave a few seats empty for high quality candidates whose plans change. You'd have to be not only be more able than the people on the waitlist to bring something unique. You'd have to be better than most of the people in the admitted class. So if you are not mearly a strong candidate, but also one that most top schools would consider for scholarship, then give it a go.
[Edited by Duncan on Apr 18, 2019]
They always leave a few seats empty for high quality candidates whose plans change. You'd have to be not only be more able than the people on the waitlist to bring something unique. You'd have to be better than most of the people in the admitted class. So if you are not mearly a strong candidate, but also one that most top schools would consider for scholarship, then give it a go.