Imagine this. The Cowboys are driving for a score, and Demarco Murray busts off the left side for a big gain at the Giants 45-yard-line. There's only 17 seconds left in the half with no time outs, and Romo hurries them up to the line. But.....the whistle blows, and action is stopped. Dez Bryant is told to leave the field. His helmet sensors have signaled to the doctors that he got an impact reading on his last block for Murray that registered too high to play the next play. He must leave the field for further evaluation, and he may be done for the game based on league rules for maximum impact. Yes, the NFL is working on helmet sensors for this very reason. http://profootballtalk.nbcsports.com/2013/09/04/nfl-moving-closer-to-using-helmet-sensors/ This would probably be the last nail in the coffin for me and the NFL.