Uh...but if no one gets it, who cares? LOL.
I'll be honest, I've been studying theme parks and design my whole life, and it really never occurred to me that IOA was based on printed media. And, actually, as I'm thinking about it - it's kind of a stretch to say that, and they certainly have never promoted that as the branding.
Jurassic Park and Harry Potter are based on movies that were based on books, but the attractions are entirely based around the movies and imagery from them. Popeye did originate as a comic strip, but he became the most popular with the public from the animation, and Dudley-Do Right began as television animation as well.
So really, while a lot of the attractions can be traced back to printed media, I'd hardly call IOA's theme "literary"...it's Islands...you have Adventures on.