Since the league moved to a 12-team playoff format in 1990, an average of about six new teams make the playoffs every year. This long history of churn among NFL teams means that it’s highly probable that five or six teams that made the playoffs in 2018 will miss the playoffs in 2019.
And what’s true for the NFL is true for the NFC as well: Six teams make the playoffs in the NFC every year, and it’s a virtual certainty that some of last year’s playoff teams won’t repeat.
In 2018, the Saints, Rams, and Eagles repeated as NFC playoff participants from the year before, the Cowboys, Bears, and Seahawks were the new playoff participants, and the Panthers, Falcons, and Vikings failed to repeat their 2017 playoff appearance
Coincidentally, that means that nine of the 16 NFC teams made the playoffs the last two seasons.