The question would seem to be--Which areas are we going to try to preserve with sea walls and other measures, and which areas have to be abandoned, either slowly or immediately. I think the second option will start to/ is already starting to happen as insurance rates along the coasts go up or insurance is simply not available.
I wonder also if at some point emergency workers will just say that they aren't going to risk their lives to try to save people or property for folks who, against all logic and science, continue to insist on living near sea level. That may sound harsh, but at some point it does not seem to me to be fair to make others suffer for ones own stupidity or pig-headedness.
One strategy, that was used before hurricane Katrina iirc, might be to require everyone who insists on living near sea level to have the parts of their body tattooed with identifying numbers so they can be put together for ID and burial purposes after dismemberment. That tends to get the message across fairly powerfully and viscerally.