This is a wild fantasy and based on nothing at all other than the voices in my head... but imagine the Overlook Hotel built on that patch of land by Fort Wilderness that everyone has designs on.
An entire hotel with a haunting theme (and Big Wheels that kids can ride up and down the hallways, of course)... instead of some redecorated rooms stuffed in an existing moderate resort to raise rates.
Yes, I know "The Shining" isn't exactly the Haunted Mansion or family friendly (or even Disney for that matter)... but since DVC resorts tend to be huge, that's why I'm picturing the Overlook rather than the actual Haunted Mansion.