I was listening to Mike and Mike last week and they said that the NFL has had something like 14 or 15 straight seasons where there have been at least 5 teams worth of turnover in the playoffs. In other words, every season has at least 5 teams that weren't in the playoffs the year before (thus, 5 teams that were in it the previous year but not the current year) for 14 or 15 straight years.