It probably means that they were the beginning of the end for hard-bound books. People started watching and seeing, and drifted away from literature. I don't think that sci-fi "prediction" has come true for the world in general, but for some people it is true... they don't want to read anything. They just "wait for the movie" or whatever. It is definitely limiting, and the idea of the removal of books as a sort of mind control... limiting ideas to only those that are marketed by the government... is an excellent warning to us all... that we need to think, not just passively accept.