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It's size and speed killing the NFL, just like most other sports.
When players were 150-250 pounds and ran a 5-6 second 40 yard dash the collisions were nowhere near as violent as they are today one every play. Human knees and ankles aren't intended to support 325 pounds of muscle while another guy weighing 310 and running a 4.4 40 yard dash crashes into you. As players continue to get bigger, stronger and faster the league needs to artificially reduce impact or they won't be able to play a full season of games. Less impact at practice, less impact in preseason, rules to curtail impact in games, bigger rosters to spread the impact around more, etc... The same way the NBA was a better game when most players couldn't dunk a ball, the NFL will also use rules to make the game harder. Moving back extra points and requiring kicker balls to make field goals less automatic. Eliminating kickoff run backs and all the rest.
The only other solution is seriously changing the gear they wear or putting in things like weight limits on players. That's the racing approach where restricting top speeds is now universal. More likely we are headed for a game of glorified two hand touch within 25 years when players are 400 pounds and run 4.1.
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