I'd suggest that the main issue might not be housing, but rather childcare. The cost of childcare is incredibly high, more than many (most?) mortgages or rent payments. Unlike previous generations who settled in the suburbs close to family support, many of us are now gravitating back to city centers away from relatives who could help with childcare.

Raising children requires a substantial commitment of time – they're undoubtedly rewarding for many who choose to have them, but it's completely reasonable why some people would be hesitant or even opposed to the idea.