For most things, appointment media is going back to where it was prior to the 20th Century: Live performances, including sports, where seeing it with a crowd is part of the appeal. Scheduling your day to catch a program, be it "Fibber McGee and Molly" or "Leave It To Beaver" or "Cheers" or "Friends", will seem as bizarre to someone in 2050 as it might have to someone in 1850.
YouTube does occasional appointment media. Early in the pandemic, they did a global showing of Yellow Submarine that required watching at a specific time on a Saturday. It was my kids' introduction to the movie.
Not generously. It was very much a thing in the 80s and most of the channels of the 80s are still strong although there is the ineluctable transition of all basic cables towards showing nothing but Law and Order reruns.
