There was a time when the Dallas Cowboys football team was the cream of the crop, dominating the better part of the 90's with the likes of Troy Aikman, Emmitt Smith, and Michael Irvin among others. They won three championships with those stars, but those were '92, '93, and '95. Since then though, they have not lived up to their lofty standards.
In fact, with it being over 20 years now since that last championship in 1995 "America's Team" is starting to get a little bit skittish about the long term effects on their fan base.