Books are, in many cases anyways, an outdated medium. Or at best, a medium that has fierce competition from many other mediums that did not exist for the majority of time the printing press has been around. There's just so many ways to consume fiction today and the barrier to entry is essentially 0. Literature still has its place but that has always been a very small place for the highly intellectual - a limiting factor on its own. Similarly for non-fiction, there's just so much competition from other mediums that frankly, people tend to prefer over books.

People who love reading (I count myself here) will continue to and books will be viable to them. But the vast majority of people only ever read because there wasn't an alternative.