The Super Bowl win spoiled the fan base. It's hard to get them to go back to being happy to be fans of a competitive team that doesn't win it all. Every year that they don't win the Super Bowl feels like a failure to them.
For me, it's odd. Winning that Super Bowl kind of felt like the completion of my journey as a fan. We won the final boss battle and I got my trophy and prizes. Now we are just replaying the game on a higher difficulty level. I was never into replaying an old game. Unlike buzd, I don't love nostalgia.