The NFL recently voted to change its overtime rules for playoff games, but leave the existing rule in place for regular season games. Mark Maske reports in today's Washington Post:
Competition committee members have said they didn't propose the new system for regular season games in part because of wariness that the possibility of longer games would increase the risk of injuries being suffered by players.
The NFL seems intent on adding at least one, possibly two games to the regular season, which would increase the number of plays by approximately 150 per game, yet is worried an extra dozen or two plays a year (few teams play more than one overtime game each season) will be too risky.
Of course, they can charge for the two extra games; overtime is free football, and, in the NFL, ain't nothing free.