There are many issues with housing and its not a one approach solution in any regard.
Cities and towns need to densify! Density done right, adds the ability for sustained mass transit, we need places made for people, green spaces, parks, plazas. Remove the need for cars inside towns and cities. If it's not walkable, enjoyable, and easy to get around a city has failed.
Density cannot just be 40-100 story towers. Density that is human scale is 4-6 floors low/mid-rise. Some examples of low/mid-rise in a walkable mixed use neighborhood.
Notice the skyline where there are no massive Skyscrapers.
Together with density housing like this needs to be made for the people living there, not the investors selling the units. More family sized units are needed, that are affordable and enjoyable to live in. Less bachelor units, or single bedroom and dens that sit empty on the market.
The North American sea of single family home style developments is something we as a country need to move away from. We need more mixed use communities built with many housing types. The Canadian housing market needs options for people, it should not only be a choice between a single family home, or a massive skyscraper tower. We need more missing middle style development.