The problem with a 40-50 yard penalty, ball at the one, is that the refs have virtually given the "O" a sure 7 points. The games, especially championships, should be determined by the players, not the refs.
That being said, if you made PI a 15yd penalty, here's what the "D" would do. Any time you're beat, do the PI so as not to give up 7. It would be the new strategy