I think the NFL " demise " is greatly exaggerated.....yes, the ratings are down...but the NFL still completely destroy the competition....it was/is/and for at least the near future, will be king of American sport...nothing ( NBA, MLB, NHL, NASCAR etc,,) comes close....
It's like Bill Gates losing a million bucks...he probably wouldn't like it, but also wouldn't lose any sleep over it....The NFL owns the #1 spot and that won't change for a while...their lead is so big, it would take several years of " decline " to really make a difference....