I would love to see something like this in either MW/DW in the western/mining themed areas. I reckon around 10-15 mil could build a really good immersive haunted style dark ride that could be rich in theme and ideal for a broad demographic.
Without offering physical thrills, such an attraction could terrify it's audience by using a suite of sound, lighting and visual gags to really involve and 'isolate' riders.
Naturally, MW would do it better but DW COULD do it better and possibly NEED it more..But would they? Yeah, not any time soon whilst a bank owns it. Such a ride would be a perfect complement to the Gold Rush Country area perhaps the Riverboat island?