On the other hand there is more flexibility in assignment as you have an extra guy standing who can more easily drop into a zone to try and slow that seam route or fill a gap on a blitz. If you are turning football into an 11-11 sport, I think there has to be advantages to having a more athletic OLB with QB assign than a defensive end, especially now when you have specialized DL for running and passing downs.
Obviously it comes down to how you use them, but I kind of feel like the roster of a 3-4 is going to offer more flexibility and adaptability. Or maybe I am just praying that is the case.
Maybe since linebackers, as a rule, are taught to read and react more than defensive linemen, who are basically told to bear on right ahead. But that's the whole point, right? Making athletes take a second to think - giving the offense an advantage.
We need to go back and look at how teams used to defend against the veer. By the way, I remember vividly Dr. Z (before his stroke when he wrote MMQB) talking about the potential of running the veer with Vick, Griffith (he was good for about two seasons) and Dunn in the backfield. Dr. Z is the GOAT.
In the back of my head, I really do wonder if there's going to be a severe overreaction to the effectiveness of the read option. Somebody in the league is going to figure out what works, and the league will adapt.
Now, the difficulty will be that your defense is going to have be more multiple than ever - you'll play a pocket passer one week, a running team one week, and then a read-option team the next week.
Unless you've got Ngata and Raji on your defensive line, it's difficult to imagine that you'll be effective against all types of defense.
3-4 always comes back to whether or not you get a form of "dominate" NT in the middle of that line. Whether it's just the massive NT or an explosive play-type NT. Anything to force the double team, negating a guard getting to the 2nd level.
If you can also have DE's that demand that kind of respect of a double team, then the offense is boned.
All of that is also why Dominate D-Lineman are picked early in the draft, and in college, 5 star D-Lineman have a better success rate in comparison to 5 star players at other positions.
Defensive linemen bomb out in the NFL all the damn time. I mean, hell, Pittsburgh just hasn't been the same since that defensive line has gotten old and brittle.
I forget who wrote this - might have been Gil Brandt actually - but the writer said that defensive line at the NFL level was the hardest position to master as a college player. He said that the front office tended to give defensive linemen about three seasons before giving up on them due to the huge difference in size and speed faced on every snap.