Gentrification eventually hurts even the gentry, when it crushes the interesting spirit that attracted the gentry to the city. It is happening now to some cities famous for their music.

San Francisco used to be a great city for artists of all kinds, but I don't think many artists can afford to live there now.

The preference of gentry to live in cities, rather than in the suburbs they preferred 60 years ago, has made city housing scarce. The shortage makes thousands homeless and drives millions into poverty. So US cities need lots more housing space. It needs to be dense and accessible to mass transit.