I've been saying this for years, the game has changed a lot, the idea of parity in the NFL is a joke. Its the teams that have qb's and the ones that done. For something like 16 out of the last 18 years the QB in the SB from the AFC has been Manning, Brady or Roethlisburger. That trend will likely continue. The NFL used to have parity, not anymore.
Sure you can take a shot here and there with an adequate QB and a good defense but to consistently compete for the Superbowl year in and year out requires a great QB and coaching. People want to talk about "it all starts up front" and "we need weapons". What we need is a great QB and great coaching and the rest will take care of itself.