I saw that video and i was surprised cause that was what i imagined before about Elsa that Prof.Charles Xaiver could have done a better job helping her and teaching her control and non-fear of her powers. and that was interesting! of course if it was magneto,he would have just attempted to use her to wage war on the normal people and just make things worse as always. chuckle!
If Incredibles was a pre-emptive trolling of Fox by Disney over using the Fantastic Four concept in film, then Frozen was trolling Fox over the X-Men films. Frozen carried some of X-Men's central themes better than the actual X-Men movies did.
Or perhaps Frostbite... (In an X-Men Destiny scenario where she works alongside Aimi Yoshida (the female PC from the game, most suited for the Energy Projection powerset) against the Purifiers and Bastion.)