honestly, I don't think there's a problem with the current format. I think it might be something like 30% of the teams that win the toss take it the length of the field for the FG and win. Alright, that seems a bit favorable, but I believer overall they only end up winning sligthly above 50% of the time. It seems easy for the coin toss winners to march down the field and kick the FG when they do, but if a team downs the ball goes three and out the other team should be ending up with some terrific field position. It may be slightly slanted, but there was already 60 minutes for one team to win it outright.