is one day the NFLPA and the NCAA put restrictions on what a helmet "can do" upon impact... just as the PGA puts restrictions on what the golf ball can do. In the case of the NFLPA, it'd be the players protecting

Kill shots, kill shots and more kill shots. It's what makes the highlight reels and SportsCenter and it's filtering down to even the high schools now. Watch any sideline of a player who makes a kill shot on an opponent -- they're Jumping Jack Flashes and I'm sure their coaches are ready to pound backs in congratulations.

Only when a player knows he could seriously hurt himself if he tries for a helmet-to-helmet kill shot will this change.