The decline in book reading as another sign of the cultural degeneration that is eating away the World character.
Why read something as challenging as a book when you can spend all your time on Twitter, Facebook or Instagram? They are much easier and provide entertainment, gossip and information.
Book sales are seeing a welcome increase, still digital reading is very likely to continue to evolve as publishers become more familiar with new technologies. Life without electronic publishing, websites, blogs, twitter feeds, search engines, etc. is unthinkable.
Books and screens are not old technology versus its inevitable replacement, they are different and complementary, each stimulating particular modes of thinking.