IMO new orleans is gone. A city below sea level is just not going to work. Even if they block up the holes, pump all the water out (and that's a lot of water!) and rebuild, what stops another hurricane who knows when from tearing it all down again? It's just a very bad location to put a city.
I should probably add that I am probably wrong before I get eaten!
I'm not going to eat you. I was interested to find out that NO was not below sea level when it was first built. It has been sinking. I think that made me feel better about it's beginnings.
"It's just a very bad location to put a city."
It's a bad location the way the low ground level is now to rebuild a NEW city. The right kind of innovative engineering over the next twenty years could redesign the grounds and barriers and not have it so crammed full of structures.