I know that every year fans of thirty one out of thirty two teams are disappointed. Chiefs haven't won a playoff game... Falcons are always one and done... This, that. My fellow Eagles fans got tired of Andy Reid because he just couldn't win the big one so five NFC championship game appearances in a decade wasn't good enough.
Here's my perspective. In my first decade of being a football fan the Eagles averaged four wins a season. They had one season where they hit .500, going 7-7. Generally they were out of the playoff race with about six games to play. In the next two decades they were much better, making the playoffs nine times out of twenty and losing in the super bowl once.
That covers my first thirty years as an Eagles fan. Then came Andy Reid and now Eagles fans think two years in a row without making the playoffs is the end of the world. They're young enough to have missed out on that ten years without a winning season, or too old to remember it.