The argument for books as a medium is a fair one to make, but overshadowing this is just what students end up using. When I was in high school a couple of years ago books were almost never used for research purposes (despite a well stocked library) - we grew up using the internet for research, and as far as I can tell didn't suffer too much for it.
Books being used less means that an enormous school library just doesn't make sense for schools with limited resources.