Living a continent away, at an elevation of around 500', my opinion is really rather worthless. It's easy for me to be callous and uncaring and not take into account the human values involved.

Having acknowledged that, since the situation will only get worse and since there is no solution which won't be overwhelmed, is there any realistic choice but to abandon the area?

I hadn't thought of infrastructure problems, and they seem to be many and daunting. Fresh water contaminated and difficulty in getting rid of sewage from flooded pipes are only two issues, and they are major.

The economic loss suffered by people displaced by this would probably be handled the way people displaced by the next California earthquake would be. In my opinion they have willingly exposed themselves to a certain disaster, by choice, no coercion, and should be responsible. However, politicians would be making the determination and would at least see that the larger corporations would be indemnified. Your basic schnook wouldn't be, though the law which covered large corporations would seem to include Joe Six-Pack.

I suspect habitation in the flooding areas of Florida will be allowed until the last people can't make it. Then the papers will be filled with sad articles of folks losing their last dimes and doomed to homeless starvation unless the government reimburses them for their folly. And, Florida being Florida, it will.

And, it should be abandoned, sooner rather than later.