Hard copy will never go away. For one thing there are - and always will be, IMO - folks for whom "book" and "reading" involve more than "text" and the visual ingestion of the text. Books are more than aggregations of text on the physical page.

For another, there will always be folk without access to electronic repositories; hand-held, wireless etc. notwithstanding. And there will always be those who choose to remain outside that sphere; folks who view and will view books and reading rather as some in the 21st century might view, for example, chain mail fabrication. Or even more, who knows.

It's rather like surmising that since Gutenberg, there would be no illuminated MSS produced. Didn't work out that way; illumination changed, to be sure, but the concept of illuminated text (or or illumination/illustration as a component of text) survived.