How many will listen to tape and vinyl in the next century?

Let's hope you are right. My immediate concern is that people themselves tend to become sort of digital, unnatural and consisting of bits and pieces. Just take a walk around Manhattan while making yourself 'invisible'.

Also, question is how to preserve master tapes for centuries. They got to think of something not just digitizing everything, though this should be done too.

Zero

The odds are better in Vegas than betting on this one. Plus, it's too early in the current century to make such a prediction...oh wait, I get it, this was an invitation for smiling and good natured trolls, cynics and SNL wannabes.