Cities have the infrastructure, amenities and communities. It's only 'cism that pushed affluent people out of the cities. In more (historically) homogenous societies where white flight wasn't a factor, the suburbs are where people who can't afford the city live, not vice versa.

People SHOULD want to live in the cities (or completely rural areas). Dense population centers are what birthed society and civilization. Humans are meant to live in close proximity with other humans.