Re: Ideas on how to achieve time travel
I don't think its a good idea for Mystique to be the time traveler since she's still so innocent (the First Class Mystique) and inexperienced. Plus it would be odd that her character would get so much purpose and presence in the movie. In the original trilogy, she was only a supporting/secondary character. The ideal time traveler/s are Professor X, Magneto and Wolverine. If those 3 characters (especially Magneto) have to bring someone to accompany their journey, then I wouldn't mind if Mystique is one of the time-travelers but her to be the one and only time traveler would be an odd decision.
X-MEN: DAYS OF FUTURE PAST
The future of X-Men's original trilogy cast begins this May!
Hugh Jackman - Halle Berry - Ian McKellen - Patrick Stewart
Anna Paquin - Shawn Ashmore - Daniel Cudmore - Ellen Page