Florida is toast in my opinion. Miami may be a special case.
New Orleans is definitely a special case in my opinion. It is too culturally important to lose. Heroic measures are justified.
All places at sea level eventually going to be swamped. The main uncertainty is when.
And most populated places at sea level are in some form of denial, which is explicit and frank in some places. For instance, Galveston, Texas, is particularly at risk and in particularly vehement denial about it - they would be sinking due to local mismanagement alone and the real estate community is admantly against recognizing the fact.
Mortgages and financial arrangements are written with 30 - year return periods. Therefore everyone with property is interested in the risk being perceived as nonexistent or very far in the future.
Typically the people with the most property in an area are the most influential. Therefore denialism concentrates among the elite on the coasts, especially in areas on broad, shallow coastal plains or on sandy beaches.
In my opinion this is NOT just DESPITE them being among the most at risk.
To the contrary, they deny because they stand to lose considerable wealth the instant that the sea level rise problem becomes perceived as unmanageable.
They deny BECAUSE they are at risk, and they want another buyer to come along. Like anyone selling or potentially selling defective property, they are not motivated to admit the defects.