I don't think they hate reading books, I think they rather are attracted more to other activities like social media, watching videos on youtube and playing games. A few decades ago there weren't that much attractions as nowadays to spend your time with and reading seemed one of the most pleasant ones. I remember before video games and having a computer I was spending almost two hours a day reading, but that time decreased with the evolution of technology. At least in my situation. There are still teenagers who read daily, on kindles or classic books so we're not doomed in this regard.