The most hotly anticipated addition to the MCU is easily the X-Men, but introducing mutants can either fix the X-Men's biggest problem or create an entirely new one. Mutants are coming to the MCU in an X-Men reboot sooner or later, and it could be that their joining this late in the game will actually fix one of the biggest problems looming over their comic book counterparts. At the same time, however, this could also create an entirely new and equally significant problem for the MCU's mutantkind.
Having been introduced in 1963's X-Men #1, Stan Lee and Jack Kirby created the characters with the initial idea simply being to avoid having to explain the nature of their powers. It wouldn't be until later that the group developed into the allegory for prejudice and discrimination that they came to represent, appropriate seeing as the comic began its run in the heat of the American Civil Rights Movement and was originally canceled shortly after it. The characters really exploded in popularity under the penmanship of Chris Claremont, who was responsible for many of the team's most popular storylines, including Dark Phoenix (1980) and Days of Future Past (1981).
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For all of their success, however, one criticism looms over the X-Men to this day. They don't make an abundance of sense in a shared universe with many of Marvel's other non-mutant superheroes, especially as so much of their story has revolved around their persecution. This is something that the group not being added to the MCU until now could potentially avoid. However, if the introduction isn't handled with care and meticulous attention to detail, then this late addition could make their lore
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