IMO when ranking teams as "top" franchises, you not only have to take into account success, but also the fanbase and "aura" of said team. With all that, I agree with the OP's list.
Sorry, our lackluster fanbase and limited success in the 80s/90s keeps us at 5. The Packers were THE original dynasty and had a pretty dominant run through the 90s/early 00s. Their fans are highly supportive and Lambeau is one of the toughest venues to play at.
Dallas is kinda like us. Most of their fanbase exists outside the borders of Texas, and they can be found in considerable amounts in every road game the team plays. Thye get as much exposure on the airways as the Lakers do, and they have the pedigree to back up their success. I hate to say it, but they belong as number 2.
Pittsburgh has the trophies and the history. It is more of a local team, and you hardly find Steeler fans outside the boundaries of Pennsylvania. Regardless, they were the team of the 70s and have been a powerhouse this century for most years. And thats not taking into account the 90s, where they were always a force in the AFC and made the SB once in 1995.
Chicago in a tricky one. On one hand, they havent enjoyed the same amount of success as us. But on the flip side, they have a loyal fanbase, a tough venue to play at, and they boast a solid history. Not to mention there are a handful of great/dominant players that played there and stamped the Chicago Bears seal in the NFL.
I give our team the 5 spot. We were dominant for 2 decades, and for all practical purposes our golden era was really the 80s -- we took a good thumping by the Cowboys and the Packers in the 90s, with a lone SB title in 1994 that was arguable bought by Eddie D. Of all the aformentioned team, we have the weakest fanbase and the "aura" of Candlestick doesnt scare anyone. If we were to win another title or 2 this decade, I would put us above Chicago, OR if NY were to win a title or 2 this decade I would put us at 6.
But I dont think we'll ever beat GB, Dallas, or Pittsburgh.
[ Edited by HudsonValley on Apr 1, 2013 at 10:56 AM ]