Yup, but these things go in cycles. Yes, it has become a passing league -- so what do defenses do? They find personnel that are best suited to stop the passing game, more mobile, better in space, etc. Then what happens? Team A realizes that because everyone is focused on stopping the passing game with faster, more mobile players (albeit lighter and not as strong) having a stout running game might really give the team a unique quality that defenses are no longer designed to stop. Team A has a tremendous amount of success with running game. Other teams see that success and start designing their offenses around a strong running game. Defenses then start to tailor themselves to stop the running game. And so on...
BTW, guess who Team A is this year?