Whenever I go to Disney World, everyone in my family participates. However I don't have as much fun as everyone else. I know that now my parents are interested in KI after Planet Snoopy(even though its more of a younger child environment) I have no problem with KI getting dark rides, but I don't see them doing this as like you said, everyone views them as a Thrill Ride Park.
Also disney World is doing so well as 1) Orlando is a Popular vacation spot 2) Countless millions spent on advertising throughout movies based on rides (i.e. The Haunted Mansion, Pirates of the Caribbean) and 3) Nobody hates the Mouse!