Will D return to former dominance over next couple of years?

I am talking about the type of D where the other team is doing good to simply get a first down, or cross midfield,and avoiding turnovers by not having it pried from their grasp,because getting into the endzone is next to impossible type D. Have offenses gotten the upper hand in the SEC with the likes of Sumlin and Malzahn? Or is our team in the process of bouncing back from the recent NFL defection?