Where in the guide did you see this? -What page?...
I think the attraction has very little chance of closing, it's always packed when I head down. It's pretty old, maybe a refurb would do the trick.
The Unofficial Guide page 636. It is a little box called ,Behind the scenes with Jim Hill. It says "This live stage show will be closing for good sometime in 2007." It then goes on to talk about the Broadway thing.