What goes up must come down. That's the natural law, be it in fiction or reality. That was true for the iconic Marvel Cinematic Universe (MCU) character Iron Man, which Robert Downey Jr. played with panache. He rose to prominence and finally went down, although he took down Thanos with him, concluding the Infinity Saga.
But if we look at Downey's past interviews, we will see that he has hinted about the fate of his MCU character in the franchise. While promoting Avengers: Age of Ultron (2015), the second film in The Avengers series and overall 11th installment in the MCU, he discussed the film's villain, Ultron, voiced by James Spader. RDJ said,
"He’s working on a system that will make it so the Avengers really won’t have to do what they’ve been doing all along which, purportedly should be the endgame."
And then we had this dialogue from Tony in the film that he says to Captain Rogers (Chris Evans):
"Recall that? A hostile alien army came charging in through a hole in space… we’re standing 300 feet below it. We’re the Avengers. We can bust arms dealers all the live-long day, but… that up there? That’s the endgame. How were you guys planning on beating that?"
Cap told him they'd do it together, which we saw in Avengers: Endgame, though there were cracks among the Avengers in the later films before we got to see those sparkling portals bringing everyone together.
Tony and Steve proved each other wrong in Avengers: Endgame

We know how the friendship between Tony and Steve has been. For those who don't know, just know that you'd have to go through a lot of movies to get a fair idea. But we will make it easy for you.
Avengers: Endgame sees Tony Stark as someone who sacrificed himself for a greater good and Steve Rogers as a worthy human.
Tony had to do the snap himself because, as Doctor Strange told him, there was no other way. However, his body wasn't ready to go through the kind of shock that the snap gave him, unlike the Mad Titan Thanos (Josh Brolin) or Bruce Banner (Mark Ruffalo), who were able to handle the snap due to their super strength.
Stark knew that he wouldn't survive the snap, but he chose to snap regardless in Avengers: Endgame. Just so we are clear, this is what Steve Rogers told Stark in the first film in the series:
"You're not the guy to make the sacrifice play."
Before this, we also see Captain America finally wielding Mjolnir, the hammer of Thor (Chris Hemsworth), in Avengers: Endgame, which only the worthy could wield. There is even a scene in Avengers: Age of Ultron where Odinson allows everyone to pick it up, but no one is able to do that.
And just so we are clear, this is what Tony told Cap in the first film:
"Everything special about you came out of a bottle!"
Cap didn't just pick up that hammer in Avengers: Endgame, he beat the Mad Titan to a pulp. However, it wasn't long before Thanos dominated the trio again.
All in all, they proved each other wrong. Tony sacrificed himself, and Cap's worthiness didn't simply come out of a bottle — evident when he covered that grenade before he became Captain America.
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