One might wonder that if it's such a great novel, why are we getting this adaptation only now. Well, there have been adaptations and plenty of them. We have the 1984 film directed by David Lynch which wasn't a commercial or critical success, unfortunately. Lynch is one of the most important filmmakers of his time but it didn't quite happen for him but it's got a cult following since. Other great directors like Ridley Scott and Alejandro Jodorowsky made an attempt but it didn't materialise. There's a 2013 documentary on Jodorowsky's vision.