Which Has Greater Impact On NFL’s Future: Rules Or Violence?

One of the biggest topics of conversation over the last few years in the NFL has been the actions taken by the league to change rules and try making the game of football "safer." These changes have led to certain people, including Ravens safety Bernard Pollard, believe that the league will suffer from all of these rules changes and the violence in the NFL is fine. What do you think will have a bigger impact on the future of the NFL - the rules being changed or the violence of the game?