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I switched from majoring in journalism to math. Oddly enough, it was a journalism professor who encouraged me to do this (and you could say he wanted me to fuck off, but I've won writing awards and scholarships).
Journalism is in a transition state right now, and a specialized writer is often better off than one with a general degree that may be obsolete in a few years.
There are a lot of great things you can get out of degree that focuses on writing. Any driven person can teach themselves these things (or be taught outside of school for much cheaper) and most of those degrees don't offer much economic incentive beyond the knowledge (besides academic/scholar jobs).
If you want to become a writer, start pursuing it now. Write and become involved with any sort of writer's network around you. Contribute pieces to smaller publications to build a portfolio.