I'm genuinely curious: in the mid / long term will this lead to more affordable housing, or just more densification? If duplexes are the new norm, wouldn't stan

I'm genuinely curious: in the mid / long term will this lead to more affordable housing, or just more densification? If duplexes are the new norm, wouldn't standalone single-family houses just become more expensive? Are there any case studies to show how densification relates to housing prices? I've been reading that in places like Vancouver for example, factors such as speculative real-estate investment and money laundering have been found to be driving up housing prices and are having to be addressed with other specifically targeted measures that go beyond simply allowing more units to be built. If densification is one part of the solution, are there others, and what are they?