A rising tide lifts all... houses?

An interesting idea to deal with storm flooding - houses that float, including retrofitting existing houses to float. There have been several hunting and fishing camps in Louisiana built like this in the past to deal with seasonal flooding, and I understand they do work. My concern with the concept would not be water rising inches per hour, as it does with seasonal flooding, but with water that rises inches per second and wind-driven waves measuring several feet between crest and trough. These are dynamic forces that a typical residential structure, and especially an existing structure, are not designed to resist. I also am very suspicious of the $20,000 cost for the retrofit, particularly after seeing recent cost numbers on our projects in the area. But, the proposal was put forward an associate professor at the LSU Hurricane Center, so I'm sure they have considered these issues.