Bronco Mendenhall took a big risk when he left BYU to take over Virginia’s football program three years ago. The Cougars had posted 11 straight winning seasons under Mendenhall. The Cavaliers had put up just one in the last eight years. The announcement Thursday of a $500,000 gift pledged by Mendenhall and his wife, Holly, for a new football facility is a clear sign he believes he made the right move and plans to be at Virginia for the long haul.