There will need to be a federal bailout to relocate everyone who needs help. The government should also probably announce a policy that there will be no future disaster relief that involves rebuilding, only relocating.
New Orleans will be the first, but not the last American city to collapse. Miami is probably next. Salt Lake City could very well run out of water, nevermind the increasingly toxic lakebed. Phoenix too. In the next hundred years people are going to learn why environmentalists use the word "sustainability" so much.