In April of last year, as the final season of “Game of Thrones” approached its finale and “Avengers: Endgame” had just arrived in theaters, critic Matt Zoller Seitz identified the confluence of the two events as a pivotal moment in the entertainment industry, marking “the decisive defeat of ‘cinema’ by ‘content.’” He writes, “Both are mega-entertainments that are meant to be experienced on the largest screen possible (theatrical or home) in the presence of others.