Ur the 1st person I've seen adress the bigger picture here...because EVERY team pushes ball carriers down the field when they are stood up by defenders in the open field.
But here's one: what if 1 defender meets 1 ball carriers in the open field and they "lock horns". Offensive players as you mentioned won't be able to come and push the ball carrier from behind further down the field. BUT...what about further defenders? Will they be able to "gang tackle" one guy, as is the case now, and use the force or 2, 3, 4 guys to drive 1 guy back? That doesn't seem fair either! And I HAVE seen dudes get hurt because they were gangle tackled.
This is a very slippery slope we're on.....