Magneto will retain his power?

I think that little end to the movie was significant in that it showed the SLIGHT possibility that there COULD be another X-men movie. BUT, what I think it showed was that the story (as just a story) will always continue. It will always have SOME reason to continue. So, I don't think there will be an X-men 4. IF there was, sure, Magneto would be back, with whatever powers he had regained.