happily sufficient numbers of the middle classes dream of living in a high rise block to make them very profitable. And sufficient numbers of elderly people dream of living in a high rise block to make them popular.Cities in the sky is a middle class dream and has only ever worked for the well off or those living in a country with a better standard of living across the board and less of an income gap.
You write with the certainty of someone who's never been to Paris, to Madrid, to Milan or to Stockholm, much less to London, where high-rise living works in the sense that people queue up to pay money for it (I once saw two people fight over their place in the queue) and love it when they move in.