Intuition tells me that you may be overreacting. I heard of applicants who thought they bombed their Gtown interview only to receive an acceptance later.
... you may have a poor interview and maybe you won't ... Caint" 's post of his interview with Georgetown. I know its ... would suggest to decline the interview. Why do it if you ...
Very realistic with your diagnostic, if you're willing to work. But if you are set on NYU, Columbia, Harvard, or Yale, I'd aim a bit higher -- in the 172-175 range.