This is what I would expect to happen in Manhattan, for instance, as a response to sea level rise, rather than the dystopian abandonment you see in movies like

This is what I would expect to happen in Manhattan, for instance, as a response to sea level rise, rather than the dystopian abandonment you see in movies like A.I. Not that you would necessarily raise skyscrapers, but that you would raise the street level, and change the street level entrance of the building. Smaller buildings could be raised though. It's not an outrageous idea. More outrageous I think is the idea of abandonment. Maybe people think of sea level rise as happening overnight.