The threat to the NFL is the same threat the Catholic Church and the tobacco industry faced. They are fearful of lawsuit judgments that will force them into bankruptcy. Every day, a new player adds himself to the concussion lawsuit. Juries tend to award on the basis of how much money the defendant has. The tobacco companies paid a fortune but avoided bankruptcy. Many Catholic dioceses are filing for bankruptcy.
The NFL has a huge problem here. Imagine how the fact the league allowed bounties for injuring players will look in front of a jury.
The Kurt Warner story is potentially devastating.
The unfairness of it is the very players who engage in head hunting and bounties turn around years later and sue.
Boxing gets around this because it is an individual sport and there's no "coroporation" to sue because you work for yourself. The NFL, and NCAA, are in a deep pickle here. they have to do more to reduce head injuries but have players who don't want to comply,