Nobody has thought this through. Public transportation will have to be provided. Services are going to have to be accessible. With high density housing, there are going to be more people out in the streets and on sidewalks, which means increased demands on police and other public safety. What about the increased need for sewer lines? The damage that will be done to roadways? Getting to the movies and other recreation?
This will be an irreversible disaster.
Third world cities.