My theory is it all began with the 1990-93 Buffalo Bills. Getting to four consecutive Super Bowls was remarkable, but losing all four turned them into a punch line.
Apparently, the football gods didn't like the jokes, so they decided it would henceforth be impossible for Super Bowl losers to quickly return. Fate would be as foul as needed.
Maybe you're skeptical. Fine. But consider the 17 Super Bowl losers since the Bills.
Eight of the 17 didn't make the postseason the next season.
Of the nine who did, only four won a playoff game. And none won two.