South Beach has really been revitalized since they knocked down the old Miami Beach Kennel Club and built all the new buildings. Looks like the only way those people who live/work on Fisher Island have to come and go is by a ferry or in their private boats. That seems like a pain but they must like it.
We moved from Miami were I was born 28 years ago and I really can't say that we miss it much. But we still make an occasional visit to the Keys.