When I was in my teens and 20's(the 60's-70's) every friend I knew either bowled, or golfed, and/or followed Horse racing, They watched or played baseball/softball, watched football.
Now? I have 4 daughter all in their 20's. Not a single 1 of their boyfriends, or husbands, or their girlfriends husbands or boyfriends golf, or bowl, or follow HR or play softball. Very few really care about baseball. But here's the thing, most really don't 'follow' football like kids/young adults did years ago either. They follow it because of their fantasy leagues, or football pools. But few sit there every Sunday and watch every game like people use to. If they got something else to do? They're gone. They maybe catch some of a game on their phone.
BTW--- 15 years ago there was 4 bowling alleys around here, now there's 1. In the past 5 years TWO area golf courses have closed. As far as I know(I admit I don't know for sure), but I know of NO softball leagues around here anymore. Fast pitch softball is completely dead.
Anyway my point is it is a brave new world out there. I think all organized sports are in for a rude awakening over the next 20 years.