Water is currently rolling and spilling over the New Orleans industrial canal’s west side, but Hurricane Gustav, thank fortune, has been downgraded from category 3 to category 2, and it’s starting to look like it won’t quite be a Roland Emmerich disaster film. (Thirty years ago the term would have been “an Irwin Allen disaster film.”) The worst of the storm will happen within the next couple of hours, but some are guardedly sensing that this won’t be Katrina 2. You can almost — almost — detect a slight tone of disappointment in the voices of the cable newscasters covering this thing.