Speculators hoarding the housing supply sounds like a market failure. If you believe in capitalism, the market will deal with the issue. Non-speculators will show up and build new housing, if you let them. If you don't believe in capitalism, there is always government intervention. The government could, for example, build public housing for 100 million or 200 million people, prioritizing areas with least affordable housing.
There are a lot of social problems that cause building houses in and of itself to not be too effective.
Look, in terms of supply and demand, we've never had a higher supply of people, and from a propagate-the-species point of view there's no additional demand for people either. I sort of agree that more people overall diminishes the aggregate quality of life, there is more art, music, sports, literature, and everything else created by people than anyone can meaningfully experience anyway, while all of the natural world is destroyed a bit more by each additional person. But adding 2Mm houses will give a bunch of place for people to go to and take pressure off the others.
So yes, it may increase supply, but it does less good for society than individual home ownership.
It's not a problem with building it's a problem with everything but building.
Okay but that doesn’t say anything about immigration versus commercial land ownership, which was my point. You’re saying immigration influences house purchases and I don’t disagree, I’m just questioning the magnitude of that effect compared to commercial land ownership.