I think it should be rebuilt, but done right. I've only visited New Orleans once (in 1999), but plan to again sometime (although I now expect it to be several years). The French Quarter, Mardi Gras, the steamboats on the Mississippi, etc. are too important and unique to America to not rebuild. We can't give in to Mother Nature. As far as the cost is concerned, some of it could perhaps be paid by taxes on admissions to tourist attractions. I think most tourists would be willing to pay a bit more to help pay for the rebuilding if they realize the alternative is to not rebuild and lose those attractions forever.