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Obviously they can because it has happened before. But changing a move's typing is still different since it can only have a single type. The only type that has changed after a long period of time is Curse but that one is understandable. There's no reason to change Swift's typing.
Still a change. The time in between makes no difference. It's been done before. Nothing's really stopping the possibility of it happening again. (I don't really care either way. It's not like Swift is a game breaking move.)
However history remembers me, it shall only remember a fraction of the truth.
Swift seems to be less about magical properties and more about just plain speed (JPN name: Speed Star), though there still appears to be some sort of mystical property that lets some Pokemon learn it (see: Slowbro). Pokemon that can learn Swift tend to have streamlined bodies, and a Fairy-type Swift would have been misleading because it would imply a primarily magical influence.