I'm so glad I found this thread b/c I've been agonizing over the answer I gave to this very question and wondering if a bad answer to this is a total deal breaker! The interviewer was asking "what would you do if you didn't get in anywhere"... so, I don't *think* he phrased it as "never" and thus left it open ended.
I completely forgot/didn't think to say that I would be re-applying and making sure to improve, etc, and instead said that I'd be interested in considering a research position w/animals. Does that come across badly in this context, like a major lack of commitment/desire on my part to become a veterinarian?

Somehow, in my nervous brain at the time, I was thinking that that sorta goes without saying so I didn't go as far as to state what I thought was the obvious. Gosh, I hope I didn't sink my interview with that one question. I really think other than that, the interview went pretty well. I'd be so grateful for any thoughts?? Did I miss the "critical" element to a correct response they're wanting to hear?