Its like What Happened Between "Batman" (1989) and "The Two Jakes" (1990)
Back in 1989, after many talks and negotiations to bring him in, Jack Nicholson appeared as the Joker in the first major "Batman" movie and found himself in a giant grossing summer blockbuster that brought him at least $60 million in personal income off of acting AND toy income.
So he was a giant superstar(again) and millions of people lined up to see him.
The very next summer -- 1990 -- saw Nicholson return to his role as detective Jake Gittes from Chinatown in a sequel called "The Two Jakes." Nicholson, high on his Batman fame, even DIRECTED The Two Jakes.
And it was a big flop. EVERYBODY went to see Jack in Batman, NOBODY went to see Jack in The Two Jakes.
Which illustrates a rule: in the land of box office success and possible classic status, "its the movie not the movie star" that makes the difference.
So LAST summer, Ryan Gosling was in Barbie and Emily Blunt was in Oppenheimer, and both movies combined as the phenonmenon 'Barbenheimer," and both movies made over a billion dollars(Barbie made more and there was some discussion that Oppenheimer drew Barbie fans wanting to make sure to see BOTH movies.)
So the idea of the star of Barbie(Ryan Gosling) AND the star of Oppenheimer(Emily Blunt) TOGETHER in a movie...well it just HAD to be as big as "Barbenheimer," right?
Ask Jack Nicholson.
It doesn't look like The Fall Guy will be the flop that The Two Jakes was, but the concept is the same:
"The movie, not the movie star."