[asoneth]

> we will see cites change or depopulate?

Or neither. Cities since at least the Roman era have been considered "population sinks". That is, they often maintain or grow their population by attracting surplus population born outside of the city.

As an experiment, if you ever find yourself in a large city like San Francisco, New York, London, or Tokyo, ask around and note what fraction of the residents you meet were actually born in the city.

[novok]

There are many cities that seem more child friendly than others although. Like berlin, or even new york compared to SF.

[asoneth]

Agreed. SF can afford to drive away families as long as it can continue to attract far more net population growth than the housing stock can support.

From a purely financial standpoint, skimming motivated young talent from around the world and then discouraging them from having kids or encouraging them to leave if they do seems like it would be a cheaper approach than raising a native population.