Arizona Cardinals
Atlanta Falcons
Baltimore Ravens
Buffalo Bills
Carolina Panthers
Chicago Bears
Cincinnati Bengals
Denver Broncos
Detroit Lions
Green Bay Packers
Indianapolis Colts
Jacksonville Jaguars
Kansas City Chiefs
Minnesota Vikings
New England Patriots
New Orleans Saints
New York Giants
New York Jets
Oakland Raiders
Philadelphia Eagles
Pittsburgh Steelers
San Diego Chargers
San Francisco 49ers
Seattle Seahawks
St. Louis/Los Angeles Rams
Tampa Bay Buccaneers
Tennessee Titans
Washington
Since 1996, all those teams above were different each year. They experienced coaching (both young and old) turnover. They drafted and signed free agent players. During the past three decades, at least one of the 30 different teams belonging to those 28 franchises fielded, adapted, and won one or more playoff divisional round games.
On the other hand, the Miami Dolphins, Cleveland Browns, Houston Texans, and Dallas Cowboys have fielded 30 different teams during that same stretch. Those four teams have been the same in one aspect: none of their 30 different teams have gotten within a stone throw's way of even trying for a chance at a championship.
There is another difference between Miami, Cleveland, Houston, and Dallas. Three franchises hired and fired general managers over the past three decades during their playoff futility, while one of the franchises has not.