They are staples of the Disney World Experience. They are people eaters and capacity bonanzas. They are dark rides and every park at the Mouse has them. Except the Animal Kingdom. And it needs them, especially if they want to keep the park open later. With the popularity of the new Little Mermaid dark ride, the time seems ripe to add film based dark rides.
The beauty of the dark ride is they are enclosed, even the queues are often indoors. Thus, they can be maintained with minimal ambient outside noise if need be. At Animal Kingdom, where after a lot of critters are sleeping, eating and relaxing, that can be crucial. It becomes even more important if the attractions are placed near the off-exhibit housing of the animals.