Mike I don't know. There is the omission of those classic characters that would have to eventual be solved. Also besides Connie, the dualists and maybe the GH none of the other spooks seem all that violent to me. Not even Cousin Huet because we all know he didn't do it. Then there is the issue of when it came to be a ghostly retreat. In addition if all or most of the spooks there are so because of past crimes the Mansion then would be more of a prison than a retreat.Yet  most the ghosts are enjoying themselves, they are to quote a Mel Brookes subtitle, "Dead and loving it."