Yeah, it sounds amazing, but I think it would have been a disaster. Jodorowsky never actually read Dune, and he had the grandiose, completely impractical ideas: Salvador Dalí as the Emperor, his girlfriend with no acting experience as Irulan, Jodorowsky's son who also had no acting experience as Paul (the main character). Jodorowsky saw himself more as a God than a Director, IMO.