The problem is that you are jumping the gun here. 15 years in football terms just isn't enough. The Chiefs have a classic look but have had a lull. the broncos, bills, falcons, bucs, cards, seahawks have been HISTORICALLY bad teams and altering the uniforms and style have really helped. no offense to Elway and the Bronco fans, but after the change in the team and the uniform led to a whole new respect for the team they never had before.
A classic Simpsons moment from the early 90's Homer was given a gift. Homer replies to the gift saying "The denver Broncos? Ohh..
" Marge said "I thought you liked football hommie?" "You just wouldn't undertsand Marge." and you see Broncos droppign passes and footballs bouncing off their heads. This as only a couple years before they won it all.