I would also like to add a perspective as a semi-trained archivist: One mantra among archivists is "If it isn't eye-readable it isn't preserved."
That goes for audio artifacts as well; if there is one thing that all digital formats have in common it is that they will corrupt. It may become difficult to find compatible hardware (when was the last time you saw a working wire recorder?), but the physical recording retains the possibility of playback; digital media, over and above their highly deficient sound quality, are pure ephemera.
Peter (who has, in fact, seen - and heard - a working wire recorder)