If you"re not going to shove here, then I"d be interested to know what hand you"re waiting for to get your short stack in with. The blinds will probably have been round a few times, and your stack will be gone, before you get Aces. In this situation, any Ace or any pair, and it"s an auto-shove.
Of course, if it were a satellite and you were a couple of seats away from a prize, then the fold might be the right option, but in a cash tourney I can"t think of a player in the world who would fold here.
The only situation that would ever see me consider folding here is if the UTG moves all in first. I want to get my chips in first, and hope to take down the blinds. At 10k/20k, the pot is already worth a quarter of your stack!