Yup, that's why I keep that old Edison wax cylinder player, along with the Super eight projector, my Stereo-Realist camera, and the cassette and reel-to-reel recorders. Because there'll always be adapters; they're called transcription services. Actually the Edison bit was a joke, but I have all the other stuff. The folks at CBC archives tell me the oxide will likely come off all the tapes next time I play them, so it better be to make that transcription. The VHSs of my movie oeuvre have a little while longer to go, but the actual films are getting iffy, and my buddy with the collection of 16mms is now collecting projector bulbs and drive belts.
When I was in library school we learned there's all sorts of specs and standards for safe storage, but the only proven one is lots of copies and lots of users. No one intended the lost plays of Shakespeare to disappear. Or for the last guy who could read and write Sumerian to die before he adapted everything to ….