I've been pretty clear about that for two years now, have I not? I know I've mentioned it in the last day or so here.
We saw the adaptation on offense. It was needed with the way the game has evolved.
When Saban came to Bama in 2007 they were the only team running his style of defense. Now, 10 years later, we see it all across the conference. What they are dealing with now—teams attacking the middle, underneath the back four/five—isn't any different than it was back in 2007. It's the weak part of this defense (which is one reason I've never gone apocalyptic when we've seen them do so.)
Like the adaption on offense, there needs to be some on defense. How he would chose to go about that change? I don't know that he will. I don't know what direction he'd take.
One thing we do know. The offenses of today can take advantage of the match-ups the 3-4 creates. That said, they can against the 4-3 and 3-3-5 schemes as well.
--And, BTW, this revolves around another conversation as well: Charlie Strong. People seem to clamor for him and that's something I just don't get. His defense wasn't good at UofSC, or Florida, or Texas, or Louisville, or South Florida. It's literally a decades old scheme he runs. Do fans really want to see a guy take over a defense that hasn't coached a decent defense, has been out of the position for over a decade, and hasn't done well everywhere he's been?
Secondly, you may recall when he was DC under Zook at UF. When he was fired and Strong got the interim job he wasn't hired by Foley to take the reigns of the program. Strong went with the "I wasn't hired because of my race." Not merits, mind you, race. That's not my cup of tea especially knowing how well Foley ran that program.
Of course it's all speculation and opinion. That's why I said, "I believe." 
But that's not a haphazard guess. Ole Miss returned all of their skill position guys and added a few more good ones for good measure. They did better against LSU last season than UGA in both yards produced and points. Their offense wasn't a joke last season and it's only improved this season.
We've both seen Kiffin tear apart a Clemson defense with his play calling. He's better now than he was when he was in Tuscaloosa. Where's the reason to doubt he'd have a lot of success against either team?
Simply put, there's too much recent history not to believe it to be true.
