At first thought I agree with you. But then I thought about it this way...
We had the ball on their 25 with only enough time for maybe 3-4 plays to drive down the field to get into field goal range with a QB who has already thrown 2 (should have been 3) very costly picks. That same QB despite having 5-8 seconds in a clean pocket is seeing ghosts, playing scared, and making poor decisions.
Knowing that, do you trust that same QB to
A.) suddenly become clutch? If you don't do you take the risk with the RB possibly fumbling? If he throws a pick or there is a fumble, there is enough time for Virginia (who still had 2 timeouts) to kick a field goal and end the game. And if they do there is no way (outside of a Duke lateral miracle) to get the ball back anywhere within scoring range.
Or
B.) Do you take the free 50 yards, guaranteed start in your red zone at your own 25, and trust your oline and RBs to get those 25 yards or at worst already be in field goal range?
The choice seems obvious based on the data we have. Oh and by the way I am in no way excusing Mario's game day coRching but in this instance he made the right choice to go to OT... again