How will the absence of books affect the publishing industry?

Answer for Questions & Answers for the future of Secondary Education in 2020

Books, especially textbooks are recognized as stable and huge revenue for publishing industry. Because the development of internet and digital-media, their traditional business has already undergone a severe plummet, thus undoubtedly they would be struggling to protect their existing book industry and manage to find excuse such as private, copy right to hold the trend back.