Anthony McKay officially joined the Marvel Cinematic Universe in 2014's "American Team 2" as Falcon Sam Wilson.
At that time, Sam was a good partner of the US team, who would have thought that Marvel would later choose him to be Steve's successor.

After taking over the shield of the US team in "Avengers 4", Sam gave it to the US government in "The Falcon and the Winter Soldier".
Later, after overcoming his inner struggles, he finally decided to take over the title of Captain America.
Now, Sam has become the new US team, and McKay himself has said that if he can, he hopes to always play the US team.
In an interview with Variety on the red carpet at the MTV Film and Television Awards, McKay was asked how long his contract with Marvel would last.
Questions like this are certainly not possible for actors to say directly, so McKay only said:
"I hope it's the next twenty years, that's what I hope for. So if I can play this role at the age of 65, I'm amazing. ”
Very good, next door 384 also said that he wants to play Bucky until the age of 80, when you two can form an elderly version of the cross-talk group, play a "Falcon and Winter Soldier Season n: 80-year-old man re-employed".
I believe that as long as you act, fans are willing to watch it.