IMO, concussions will not “kill” football, but they could lead to a scaling back of the violence of the game. Too many NFL players and college players are essentially taught to maim or injure the players on the opposing team. This isn’t a sport, it is a version of Christian versus the lions from ancient Rome.
A sport that requires the type of protective gear that football requires needs some re-evaluation. I don’t believe that toning down the violence of the game will take away the enjoyment, in fact just the opposite. I think it will make the strategies more interesting.
Changes could easily be made in the rules to eliminate the human guided missile effects. And I wonder if changes to bring back the old substitution rules, playing both offense and defense, would also improve the long term health of players. I don’t care how big your frame is, weighing well over 300 pounds is not good for long term health. Forcing players to play every down would eliminate the excess weight.