The NFL is the best bet in television programming. MNF not only still is on top of cable ratings, but it helps the lead in show and SVP's Midnight sportscenter get in the top 5 for weekly ratings. You can predict that the NFL and WWE will show up in Cable Top 10 each week. It also leads broadcast TV when it is on.
Unlike the NCAA, they also realized that the formatting for playoffs actually encourages television viewership and weekly interest.
14 weeks into the season, and the majority of the NFL teams still have a chance to make the playoffs.
Before week 1, basically half the teams are already eliminated from the CFP, and by week 4, most teams are now just playing for a trip to a meaningless bowl game.
It's not growing, but every television broadcast is declining.