I'm not sure I can see a lawsuit happening. Because essentially, they would be suing the NFL for the motives of players on opposing teams, and the fact that these players were proven to be dirty. We know guys like Suh and Haynesworth have been incredibly dirty players, and acted after plays were over, in order to injure other players. They weren't doing it for money, but is the money what the players would sue for? Because that seems irrelevant to me from the purpose of filing a lawsuit. Is it because it is sanctioned by the defensive coach? If so, why would the NFL be sued instead of the coach? If so, is the NFL responsible for coaches, but not players' behavior? If they are responsible for the actions of everyone employed by the NFL, then again, they could be sued for the actions of Suh, Haynesworth, James Harrison, and various others. If not, could those individuals could potentially be sued?
But ultimately, players would be suing someone because someone else attempted to injure them physically. And the precedent that would set could lead to multiple lawsuits every year of players of the past and currently would be lining up to try to prove that this player or that player intended to injure them. They've got microphones in players' helmets now (of both players' and coaches' smack talk). I'm sure it wouldn't be hard to find evidence of threats of injury. I'm guessing there are clauses in NFL players' contracts--fair or no--that are going to prohibit any major lawsuits from happening.