If it survives... I think tackling looks more like rugby. It doesn't have to be full on 'two hand touch'. But hard hits are going to have to go. Receivers are going to have to be allowed a "fair catch" zone before they get tackled (but man coverage, playing the ball, is fine). Hard sacks on QBs are going to have to be outlawed, especially from the blind side. The flip side is the refs are going to have to be given the power to whistle a play dead when someone is 'wrapped up' or stopped. No more breaking tackles, trying to knock the ball out, or trying to kill the QB. Get two arms around the runner and he's 'down'. More players are going to need to be required to be on the LOS. Blocking techniques need to be more technical and less physical. Kickoffs will need to go or at least come from a punt formation. Fans will complain it's less exciting.
Ironically, I think the future looks more like the 3o offense. People complain about the cut blocking. But the truth is the momentum of collisions in the 3o is more often at a gentler angle than a head-to-head collision. I'd rather play QB in the 30 and get dragged down 20 times a game than take one blindside hit from a blitzing LB trying to knock my head off. Or have someone dive in front of me to trip me up than hit me with a violent crack back...
