Cars and homes are two totally different things. Why even compare the two?
Also, some people do buy cars to resell at a profit. The vintage and classic car industry is one example of that.
Houses are an investment because they sit on land that increases in value over time. Some people don't even profit from the sale of their house, but from the sale of the land.
What is the argument, then?
Stats Canada makes it clear that rental housing is affordable for those making less than the median income (25% of expenses spent on housing), and that most mortgage holders are not spending more than 30% of their household income on housing.
By definition, it's all affordable if you aren't making well below the median income for an individual (which is $32,000 after tax).
Can we use more low-cost housing? Absolutely.
I've never argued against that, but I think people need to understand the definition of affordable housing and what that actually means.