The Pandemic is a game changer. sorry, pun. The entertainment industry, the sporting industry has been altered irrevocably. When the Spanish Flu was around pro sports leagues didn't really exist so we don't know the impacts. But peoples behavior will have changed since Covid-19. Although I expect outdoor sports to be better attended than indoor ones in the future I could see all audiences declining. Behaviors changing. RV sales exploding, people going different modes. I think Cocooning will return bigtime as a phemomenon and people won't openly accept attending crowded events as much as they used to. I think indoor leagues will suffer enormously. In a pandemic era you couldn't pay me to go to games in a packed arena.
That said I'm not the target audience anymore. I've attended Stanley Cup wins and GC wins. Been there, done it all. Attended Pink Floyd, Stones, U2, Genesis, Bowie etc as well. Canada vs Brazil at Commonwealth too. None of those moments will be replicated. Doesn't get better than that.
The world was already shifted into a Netflix endless streaming universe. The world watching on 4k. As HD pictures increase in quality being in living room is the best viewing auditory possibility today for any event. Increasingly going to events is an ode to the past.