The only way Frost will ever playable in a MK game is if these pathetic little Sub-Zero fan-boys learn to accept that like Bi-Han and Kuai Liang she is a cryomancer. Part of being a cryomancer is having control over ice and snow. I mean come on Bi-Han and Kuai Liang are basically clones since they are both cryomancers.
I don't think there is anything wrong with Frost at all as a character, but they need to figure out a way for her to be Both a Cryomancer and have Unique Variations & move sets. If they go in a direction similar to Takeda it could work well. Frost has to have a Freeze move no doubt but she must be unique. If she is done right, I'd be fine with it.