As much as i'd love to see Mystic Manor in Florida, we're going to have three other trackless rides debuting all within the span of a year and in the same park as Haunted Mansion, i'm not sure how well it would mesh.
To rebuddle, I would contest that Mystic is one of the best attractions in the world. Even if it's a clone, it would still be leagues above most of what the Magic Kingdom has.