"The second concern I'd have is, can he stay healthy?" he said. "We saw it with Robert Griffin -- spectacular athlete, special player. But when you build it on that mobility, you always have the concern: Can he hold up and stay healthy around these big players?"
Been saying this since the zone read made it to the NFL. Mobility for a QB is a nice thing to have, but when it's your primary skill you are doomed. You will either be forced to adapt or you will be run out of the league by injuries.
I still laugh at these people who think there is going to be some drastic change in how the QB position is played. Are there better athletes at the QB position now than there ever have been? Yes. Does the same also hold true for every other position? Yes. You still have to be able to win with your arm to be successful.