I’d throw Seattle in there too.. they won the SB in ’14, and today only 3 players remain from that roster. Yet they look like they'll contend again. That’s pretty impressive. Over roughly that same time period, the Lions have gone from 11-5 straight back to the bottom. One is a well-run franchise, the other is… the Lions.
I remember when the Packers were NFL’s Siberia - nobody wanted to play there. It took one guy to completely change the direction of that franchise. GB dumped Braatz, brought in Ron Wolf - who immediately canned their horrid coach (Infante), brought in Holmgren, traded for the QB he wanted, and so on (signed Reggie White)… the Packers haven’t looked back since.
For the last two decades, the Lions have been mostly awful. But look who’s been running things: Millen, Millen’s Mini-Me detachment, and Quinn. Just gotta find that one guy out there who can come in and turn it around.