"Humanity has NEVER discarded a format for the preservation of knowledge"

I've got an 8" floppy! Yes, one of the big old disks from the early 80s, I keep it just as a memento. Some few specialist systems can read it now- in 20,30,50 years time no one will be able to. The Digital Domesday project of the 80s was only rescued at the last moment by someone who remembered it, just like a monk copying an ancient Latin manuscript. Over the last 60 years or so we've been creating new media and discarding them with increasing frequency.

Also, the life of the media is a problem- even with current or recent technology, it's not uncommon to get out an old CD or floppy, only to find that it's now unreadable, only 5 or 10 years later.

While the Oxyrhyncus manuscripts were partially recovered with the aid of modern technology, the recovery of digital media in a thousand years' time will involve not just reading the medium and collating the fragments, but decrypting it too. Remember that we still can't read Linear-A, and some argue that we never will.