Would this be a good time to sell part of the Louisiana Purchase back to the French?

I believe I'm not the only person thinking the "unthinkable", that perhaps New Orleans should not be rebuilt. Or at least, New New Orleans ("New Orleans 2" if you prefer) should be built on higher ground. Whether you believe in global warming or not, we're clearly having some very warm years in which the sea level will rise. Wicked hurricanes are currently much more common than they used to be, and hurricanes like Katrina, called a "once in a lifetime event" by many, could happen again soon. (Make that twice in a lifetime. Remember the even stronger Camille?) The residents of New Orleans and its surround are experiencing a horrible tragedy. If we encourage them to live in the same place again, will they have to live through it yet again?
There's also a concern that flooded chemical plants in the area are leaking, making New Orleans Pond a "toxic soup." Gasoline and unearthed coffins could make matters even worse (see video link in the same article). Might not be a good idea to live there for awhile.