Fox should be trying to diversify their X-Men lineup. If Hugh Jackman decides to quit playing Wolverine or mainstream audiences get tired of his character the entire franchise is dead. The MCU had a similar problem with Robert Downey Jr., and Marvel handled it perfectly by milking Iron Man just enough to add a few more billion in the bank without relying on him exclusively. There's other characters who can pick up the slack if the MCU loses its star. The same cannot be said for The X-Men.