Timely Comics, which was established in 1939 and changed its name to Marvel Comics in 1961, has been producing sequential-art fantasy, adventure, and sci-fi stories ever since. So although it often seems like the Marvel Cinematic Universe (MCU), which has just 23 films so far, is running out of Marvel Comics characters to possibly incorporate into live-action media, that’s really not the case.
Marvel has only lately been able to include some of its most well-known franchises into the common cinematic universe due to long-standing agreements with rival film companies. For instance, the first MCU Fantastic Four movie’s intentions weren’t revealed until last year. We only now know Jon Watts, the director of Spider-Man: Far From Home (2019), is in charge. For all we know, the MCU counterparts of powerful FF-affiliated figures like the Silver Surfer and Galactus might still be years away.
The X-Men, who operated their own, largely successful film series with 20th Century Fox for 20 years, deserve the same treatment four times as much. The MCU has enough raw material to last long until 2050 if the MCU’s rulers decide to give each significant X-Man a movie trilogy, as they essentially did for the Avengers.
We’re lumping all the mutants together simply because Deadpool would be the only mutant character on a list of “X-Men Characters Not Yet Confirmed For the MCU.” That would at least be sufficient for a few iterations of its own feature list.