News flash: A team that won a world championship realized a large uptick in fan interest and feel-good euphoria;
News flash: That fan interest gradually became smugness and entitlement;
News flash: That team, which was rather flawed to begin with but caught lighting in a bottle for a couple of months, is not doing as well the next season, in large part because of injuries and age;
News flash: All of these things have led to a general gloomy vibe among those new/euphoric/smug fans.
This time the story is about the Giants. But it can pretty much describe every team in the history of forever.
(thanks to Yankeesfanlen for the link)