Around the time that Johnny Rodgers and Dick Harris were returning punts Sam Berger and Bob Geary and Marv Levy petitioned the CFL to allow blocking for the first time. The result was a decided advantage for the Alouettes. Smart.
With so many punts in every CFL game it was a weapon so effective that teams began to encroach on the no yards limit just to limit the return. It was more than worth the ten yard penalty.
It occurs that today were a study conducted it may reveal that there are a certain number of no yards penalties on punts that is in excess of the number of punts returned for ten yards or more. If the study determines that there are more no yards penalties than long returns than the game is being dulled or the excitement reduced.
Let Mr. Spock mull on this if it's logical: Increase the penalty for no yards to a whopping twenty: see how it opens up the return game.