It was mostly a joke, mostly...Spielberg and Lucas ushered in the era of big block busters with simplified stories of super villains and heroic saviors all done up with a moral message for the audience. Those type of films are still with us in superhero movies. Which is probably why people today need their movies to deliver the type of messages they agree with. Back before Star Wars and E.T...movies were more balanced with more movies being made for discerning adults. Since Spielberg and Lucas hit the big screen, movies have increasingly been made like entertainment parks.
Superhero movies were on the menu from Batman in 1966 (Adam West) and some TV movies in the early 70s (Wonder Woman, Spider-Man). And then came Superman in 1978, which was contemporaneous with Close Encounters (which I wouldn't say was a simplified plot) and Star Wars. And I think that ignited the trend toward bigger and louder Superhero films. It feels like they came at the same time as Spielberg and Lucas, not *because* of Spielberg and Lucas. Just a general trend toward reaching broader audiences who were in a mood for entertainment over enlightenment.
I suppose it's theoretically possible for a Superhero film to win Best Picture. A decade ago, who would have predicted winners like Parasite and Everything Everywhere All at Once.
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Scarecrow: I haven't got a brain ... only straw. Dorothy: How can you talk if you haven't got a brain? Scarecrow: I don't know. But some people without brains do an awful lot of talking, don't they? Dorothy: Yes, I guess you're right.
Scarecrow: I haven't got a brain ... only straw. Dorothy: How can you talk if you haven't got a brain? Scarecrow: I don't know. But some people without brains do an awful lot of talking, don't they? Dorothy: Yes, I guess you're right.