"Seven-in-ten American adults (72%) have read a book within the past year, whether in whole or in part and in any format, according to a survey conducted in March and April. That figure has fallen from 79% who said in 2011 they had read a book in the previous year, but is statistically in line with survey findings starting in 2012." - Pew Research
The concept of spatial memory is a powerful example of a way printed books will always win out over digital media. We increase cognition by associating information with places, and in the cases of books we do this simply by subconsciously remembering where in a book's pages we read something interesting.
"Memory palaces, aka the Method of loci: (loci being Latin for "places") a method of memory enhancement which uses visualizations with the use of spatial memory, familiar information about one's environment, to quickly and efficiently recall information." -- https://en.wikipedia.org/wiki/Method_of_loci