If they can just make it 24 hours, I'm sure there will be supply runs. That's another advantage of being at the Superdome. It will be the first place supplies are delivered to. Also, Charity Hospital would be a good place to go. If I were stuck and needed to find a place to congregate, that is.
The roof of the Superdome might collapse. Anyone inside when that happens might be in mortal danger (flying glass and flying debris).
Just hope the winds are under 100 mph when this storm hits NO if anyone is going to try to ride it out in the Superdome.
And also hope that no tornadoes hit during the storm (or as the storm passes, and from the outer storm squalls).
Someone mentioned seaplanes could be used to bring in supplies(pontoon planes). They are plentiful in the NW to fly to the islands....hope the governors are talking to each other....they will need these planes if there are great numbers of people in the superdome.