The athletic advantage from the rush-end position has been nullified. The tackles need merely get a hand on the rusher and reel him in or drag him around end. The "Not-Call" has become more consistent than our pass rush. Linebackers are forced to use brute force to overcome the weight differential of offensive linemen, and the whole proposition has become unrealistic. Even the larger tight ends have caught on.
The NLF judges performance by consistency, the officiating with the flip of a coin.
Unfortunately, the performance of our pass rush has become tied directly to the will of the officials to call holding penalties. The trend seems to be that it is more important to let the game proceed uninterrupted rather than strictly enforcing the rules. To attempt a consistent pass rush, teams running the 3-4 will be forced to utilize a fourth lineman or be "held" out of the playoffs.
It is a marketable game and the fans have complained long and hard that they want less decided by the officials and for the games to move on. Something had to go and I think it took the 3-4 defense with it.
The game, she be a changing.