The only regrets I ever have in an MTT is going out on a draw. I hate it. I'd not have made this call because of the board pairing on the flop. Even if you'd hit your straight on the river, you were drawing dead. Very bad. You were getting low on chips and were starting to get into the Red Zone, but I would have liked a better time to take my last shot.
Pot odds allow a call, but I don't like to think they force a call.
Better luck next time.
CJ