There are no shelters in New Orleans. That’s why they used the Superdome last time. After that fiasco, I suspect they do not want the place looted again. The hurricane plans there are to leave, or enter the taller buildings. These buildings had all the windows and contents sucked out in Katrina. There is nowhere in that bowl that is safe for large numbers of people. A levee failure or any other incident could lead to mass death.
I guess one thing that is good is that there are not as many people there anymore. Most moved away from the place....especially the ones that lived in the hardest hit areas and depended on government to do everything.