You could change the NFL a great deal by changing the substitution rules, and making players play both ways as they commonly did before about 1960. You'd probab

You could change the NFL a great deal by changing the substitution rules, and making players play both ways as they commonly did before about 1960. You'd probably see the linemen come down to about linebacker size, and the skill positions to about defensive back size. Meanwhile I'm waiting for the obsessive parents of America to read up on the cumulative effects of heading soccer balls.