Weren't those just solo films starring Wolverine and Deadpool (not even a mutant) which still referred to the characters as "X-Men" in the film anyways (Deadpool visiting the mansion looking for Colossus, X-23's comic books showing the title on the cover as X-Men.) "New Mutants" certainly wasn't more successful than the other films.
If they DID drop it, DC should snag up the X-Men name as retaliation for Marvel stealing "Captain Marvel" away from Billy Batson.