I like your overtime rules. Regular season games should just end in ties. No harm there.I don't know or care enough to make any predictions, but here's my vote for the next iteration of the overtime rule:
In the regular season, a tie at the end of regulation time goes in the book as a tie. No overtime. In the playoffs, the fourth quarter continues, as if the clock had not expired, until one team scores, and that team advances.
For playoffs where there can only be one winner it makes a lot of sense to continue to play rather than stop the game, flip a coin and kick off again. So KC/Buffalo - KC would have kicked off to Buffalo after scoring the game tying field goal because that's how normal play flows. You don't even need a clock. You run the normal play clocks but otherwise time doesn't matter - someone's got to score.