myth noun 1. a traditional or legendary story, usually concerning some being or hero or event, with or without a determinable basis of fact or a natural explanation, esp. one that is concerned with deities or demigods and explains some practice, rite, or phenomenon of nature. 2. stories or matter of this kind: realm of myth. 3. any invented story, idea, or concept: His account of the event is pure myth. 4. an imaginary or fictitious thing or person. 5. an unproved or false collective belief that is used to justify a social institution.
Wrong word to use there, IPv6 isn't imaginary or fictitious. It's real, just unused at the moment as far as I know.
(1) It's a myth until something requires me to use IPv6 to get to it.