Not that I loved how it landed I think it’s more that GoT was about as close as we get to a cultural touchstone as you get these days. Which is a far smaller audience than prime time used to be. A hit show on HBO would probably be canceled on network TV with similar audience numbers.
But the moment is over and now it’s just another show in a vast universe of streaming options.
I think that happens to just about all Dramatic shows. Same for Mad Men, Breaking Bad and other popular shows. Without the scarcity of yore, we have a constant buffet of alternatives, so who has time to rewatch (or catch up). In contrast, The Office, Friends and Seinfeld are apparently still bringing people back, perhaps because it is comforting to spend time with those characters and the viewer doesn’t need to make a big commitment.
its like Disney Star Wars - even if you like star wars, knowing how badly it's been bungled makes putting the time into watching it again or being excited about it seem like waste of effort. The payoff isn't there.