Sounds like you misunderstood my point. The cool thing about Havana is that regular people can afford to live in one of those buildings. 5 years from now, no Cubans will be there anymore, and it will just be another of the dozens of charming old colonial cities that Expats live in. The displaced locals will have a generation or two worth of cash to spend at the new Walgreens and KFCs out in the suburbs, but down the line they'll be back to being poor folk instead of middle class where they are currently.
There already exists a city with rich Americans living in it, buying overpriced Cuban sandwiches from Cuban people. Using that as a handy comparison, I contend that the median Cuban in Havana currently lives a nicer life than the median Cuban in Miami.
They're going to exchange one for the other regardless of how either of us feel about it, because that's how progress always works. But my suspicion is that a few generations down the line the people concerned will regret it.