I don't suppose they will be building housing for the large number of poor folks. My guess is that it will be the tourist industry that receives the largest share of the building funds. If my hunch is correct, you will see casinos before any type of social housing.
If they do build, why not build out of concrete? It would certainly resist hurricanes but I'm not sure how it holds up in a flood. I like the idea of houses on stilts and float houses. The advantage of stilts is that then the alligators can't get you. The disadvantage might be the wind.