Successful movies were imported into the parks, In tandem with original ideas. We got Lion King and Alien Encounter, Mermaid and Timekeeper.
Alien Encounter is an odd example as it grew out of an IP that was pulled. Would an attraction designed and built around the Guardians of the Galaxy world and characters suddenly become wholly original if late in the process they alternated the color scheme and switched out Star Lord for Space King, and Rocket Raccoon for Turbo Hampster? Would it be better?