Tony Dungy on Tebow-led offense: I don’t think it can go very long

Tony Dungy is like a lot of us when watching the Tim Tebow-led Broncos’ offense: Impressed that they’ve managed to find a way to win four out of five games with it, but skeptical that it can work in the NFL over the long haul. Dungy, the former Colts and Buccaneers coach and current NBC…