Except it's not illegal.
And the new rule wouldn't make "assisting the runner" illegal either.
It literally only applies to a player lined directly behind the center and immediately receiving the ball.
It would still be legal for OL to push a RB or WR.
The entire thing is literally sour grapes
"If the Packers’ proposal passes, Rule 12, Section 1 would be amended to say, “No offensive player may . . . immediately at the snap, push or throw his body against a teammate, who was lined up directly behind the snapper and received the snap, to aid him in an attempt to gain yardage.”