Problem is, Americans don't read much anymore, unless it's all encapsulated in a three-sentence lead paragraph.
Americans as a whole haven’t read much since Henry Ford made automobiles affordable. Bibliophiles have been a niche subculture since that time, and people who read a book now and then seldom choose politics.
So the book was never going to hit as big a market as a movie.
Actually, that’s hard to judge .. partly because of the new book methods .. you can purchase an e-copy and never enter a bookstore.
So, I think people are reading a lot more because of that. What they’re reading, I have no idea.