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From this answer:
Hawkeye is far from a filler character. He's been in every Avengers lineup in every continuity (Comics, Animated, Movie ... etc).
Why, then, does Hawkeye not star in his "own" movie? Of the 6 original Avengers (in The Avengers), 3 have had 3 films, 1 has had 1 MCU film, an...