The problem with defensive scheme discussion is that if this was just limited to Ohio State in the Sugar Bowl, I'd agree with you. But it's not. Alabama has struggled with this offense now since 2007. It is what it is, to borrow Saban's favorite phrase.
And there's a technical reason for that: Alabama's defense works on matchups and packages. Tempo hurts this type of defense more than any other, because it limits the amount of package substitutions Alabama can make. To put a baseball spin on it, Alabama has a starting lineup almost completely made up of platoon players. You can set the lineup to face the lefty starter by bringing in all your right-handed bats, but then the opposing manager starts using his bullpen and flips the script on you.
Alabama cannot -- that's CANNOT, not "might not" -- be successful unless it can match up. The problem was worse this year than it's ever been because Alabama didn't have a lot of three-down players at its disposal. A'Shawn Robinson is one. Jarran Reed is another. Dickson and Ragland are probably two others. DePriest did his best to be one but he lacks the lateral quickness needed for this defense. Having said that, he's the hidden gem of 2014 because he played so far above his previous ability level that he needs to be praised for it, but he still came up well short of where Mosley was for Alabama the last couple of years. When a maximum of four guys out of your front seven don't have to be subbed out just to change the look of the front, that's not good. The problem then continued into the back end, where Alabama had one CB playing winning ball (Jones), one good safety who got hurt in both of Alabama's losses (Collins) and a lot of issues. None of the other safeties were every-down guys. Watching Geno Smith try to play the run against the most physical teams was painful at times. And then Jackson went into a slump at the end and it all came apart.
I'm not saying Saban will change his schemes, but he either has to change them or he has to recruit guys who can play more downs against spread offenses. The old-school noseguard is now just a package player. The days of having two big OLBs who can walk up into a five-man front are probably the next to go. Take a look at OSU's SLB, Darron Lee -- 225 pounds and could play all three downs. Had 7 tackles, 3 for loss, 2 sacks and disrupted pass routes across the middle. Denzel Devall can't do that. He's not functional as a stand-up OLB on a passing down unless he's rushing the quarterback.
So either the scheme has to be modified, or the recruiting has to change. But continuing to do the same thing is just going to get the same results.