Actually, IOA can be considered literature based. Comic books, children's books, Harry Potter series, Jurassic Park series, mythology, and comic strips. Of course, two of the lands (Harry Potter and Jurassic Park) are based on the movie adaptations. But could you imagine the uproar if Universal didn't do this and took on their own visual adaptation of the books and made a land out of it?! Blasphemy. And the Pharos Lighthouse is designed after the Lighthouse of Alexandria, which I believe also functioned as a library(?). (Someone can correct me if I'm wrong)
And it's funny because only one Universal owned IP (Jurassic Park) is featured in IOA. Then Lost Continent and Port of Entry are original themed lands, and not based on an IP at all. The rest are all licensed from different companies (Marvel, Warner Bros., Jay Ward, Seuss Enterprises).
EDIT: The Lighthouse of Alexandria did not also function as a library, but the Great Library was located in Alexandria.