I am not out to attack your point, really! But here is the thing, yes the last few years have brought more success from wildcard teams in terms of getting to and performing well in the Superbowl. I, like many, love these underdog success stories. However, overall it is much more typical for there to be 3-4 favorites from each conference and for one of those favorites to make it to the Superbowl.
Dynasties still exist, even in the age of free agency. There is a reason for this and it isn't that anyone who makes the playoffs has an equal chance at making the Superbowl. If you want to be a legit contender for the Superbowl, you have to be viewed as a team that can beat the best when the stakes are win or go home.
I don't disagree that favorites are forvorites for a reason. But a four year time horizion in the modern era is way too long. If the Dolphins are smart they could be a superbowl caliber team in 2011, if they are idiots they could have the first pick in the 2012 draft.