Short answer: Not likely with current personnel. The line will apparently be without Mario, some think Kyle is done as well, and Dareus sounds at least as disgruntled as Mario if not more. Preston Brown has gone from a very bright spot to worst in the league, McKelvin & Gilmore can't seem to stay healthy, Graham is looking old and I wonder if Aaron Williams will be the player he was. In fact, I would not be terribly surprised if, a few months down the road, he decides to retire.
I think lots of current D players will be gone as Rex, with his vote of confidence from The Pegs, remakes the roster in accord with his dated system. In other words, the D is back in rebuilding mode so I don't see it improving next season. But if it is the same or worse that will likely be the end of Rex, so there's that bright spot.