We will become overwhelmed with audio, video, images and data in formats and media that is unusable. Example: 77-year-old retired NASA engineer, Lawrence Zottarelli is the last person on earth who knows how the 8-track tapes on Voyager 1 worked. Read: https://www.quora.com/What-is-the-oldest-continuously-operating-electronic-computer-and-where-is-it/answer/Brian-Roemmele?ch=2&share=42de37f4&srid=Pi3 …
Great question. Apparently there is only limited documents in the basic operation. They needed to reprogram the system to store longer bits for the deep space mission. No one know how. He was the last person to know how it could be done and at 77 he did it.