I doubt that 4K/UHD will be sent over the air for years, at least in the USA, if ever. But, if/when it is, no, it will not make any existing TV sets obsolete. Unlike the NTSC-to-digital changeover, any 4K broadcasting would unlikely ever completely replace the current digital formats.
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Chris
Quote from another forum: "(Antique TV collecting) always seemed to me to be a fringe hobby that only weirdos did."
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