[dvdkhlng]

I think we have already "lost" similar amounts of knowledge when the mechanical typewriters went away. And the mechanical calculators (and mechanical clocks?).

Or have you recently looked through a book on vacuum tube circuit design? Even more modern transistor-based analog circuit design is going to fade somewhat, as more and more parts of devices are moved to digital circuits.

It is a little terrifying and sad to see how many incredible ideas, that took a lot of smart people to develop, are basically thrown away over time.