Re: The Cure from X Men The Last Stand: mentioned in Wolverine...
There's no reason to mention it. It had nothing to do with the story.
The cure would have taken away Logan's healing factor. It would be gone (if it worked) for good. Yashida didn't want Logan to take a cure to make his healing factor go away, he wanted Logan to give the healing factor to him so he wouldn't die.
Logan didn't want a cure. He wasn't looking for one, and where he has at the start of the film had nothing to do with the cure.
”We signed a treaty with a king whose head is now in basket.
Would you like to take it out and ask it?
’Should we honor our treaty, King Louis’ head?’
‘Uh, do whatever you want, I’m super-dead!’"