Families with dependent children have NEVER "adjusted" to living in condos or apartment blocks. Anywhere. That is a HUGE assumption based on an urban myth.

Look at every major urban centre in the world and there are virtually no children in core urban areas. None. India's major 10 cities have birthrates and child habitation rates below most US cities. Almost all of Japan's children are in fare suburban peripheries of urban areas. 

Our inability to adjust to that reality and design cities with a steady supply of low-rise, ground-oriented, family sized housing is what is driving this problem. Immigration is just a demand input. Family size and fertility issues are what drives the typology of housing demand, something we've known for over 200 years.

What is going on in housing and planning policy now is intergenerational criminal.