More housing needs to be built in your scenario. It is not on the shoulders of the demand side. More housing needs to be built and it needs to be built now. We should be guilting the communities that have prevented development from happening. Not John Doe who rents two apartments.
Part of my point was that renting two apartments can be a solution to a family not having a bigger single apartment. So many people move out of cities because they need more room. So I wanted to point out that there are ways to stay in a city with a family.
When it comes to housing, a singular human priced out of housing is someone who becomes homeless