OK, I get it: pro football is so popular because it's one of the last refuges of modern life that hasn't been ruined by politics. Oops, scratch that. But we shouldn't pin the decline of pro football's popularity (as measured by viewership) solely on player protests, as the decline predates the recent politicization.
Even more troubling for the multi-billion-dollar NFL empire, the youth demographic is evaporating like mist in a scorching summer day in Death Valley. The problem for the NFL is two-fold: the number of young people who are dedicated NFL viewers is modest, and even worse, it's declining at a fast clip.
I am sure there are plenty of 25-year old fans, but anecdotally, I don't know a single Millennial who has any interest in sitting through a 2-hour pro football game at home, or ponying up the big bucks and huge chunk of time required to attend a game.
Again, anecdotally, young people seem more likely to watch a short clip of the game's highlights on Youtube than devote 2+ hours to sitting through endless annoying TV adverts for a few moments of action.