If they just revert to the HS and NCAA rule, teams will be able to push the pile, but not the runner in any situation.
I know that the NFL claimed this was difficult to officiate, but it isn't really. Both the referee and umpire are behind the play and can readily see if the backs are pushing the QB... and it is almost always the QB that is being pushed.
This penalty is rarely called at the lower level mostly because it generally does not happen if it isn't a set play. Only occasionally will a play reach a stalemate point where some player will get a belated idea to start pushing... and even then, it is legal if he pushes the pile.
In 20 years of officiating and well over 1000 games, I might have seen it called 4 or 5 times.