Because we are all bored, I googled the following question. The number of participants in golf, baseball and football. The results may be surprising. Although the NFL may be the most popular Televised sport by ratings, number of Americans playing tackle football has steadily declined from 8.4 million in 2006 to 5.6 million in 2018,https://www.statista.com/statistics/191658/participants-in-tackle-football-in-the-us-since-2006/. The number playing has remained relatively steady from 14.59 million in 2006 to 15.67 million in 2017 https://www.statista.com/statistics/191626/participants-in-baseball-in-the-us-since-2006/
While Golf has shown an increase to 24 million in 2018.https://www.golfadvisor.com/articles/golf-participation-rises-ngf
No matter how you look at it the number young people actually playing organized American football is steadily declining. That can not be seen as a good thing for the long term viability of that sport.