Set Harth wrote:
As seen at the end of X3, the cure "wears off" on Magneto after a few weeks
But we don't know that it totally wore off for him. It could be that he only retained a vestige of his former power and things stayed that way.
Or it could be that it wears off completely, as you say we just don't know. All I mean is that the possibility is there, so it's not unreasonable for The Wolverine
to discount the so-called cure. Whether they even address it at all remains to be seen.