I personally am worried not about single family homes, but about maybe one day getting to own a condo. That'd be cool. But new tiny units start at $600,000.
But what happens if you just chop down SFH and rebuild with higher density, and you don't also put restrictions on investing in the new units? You just end up with the problem we have now. We're building tons. Our local GDP is largely based around real estate. Not that we don't have a NIMBY problem — but there's only so much building you can do before you look around and feel like you just built more empty houses for people who don't live here.
You should always ask for a copy of the HOA bylaws before buying a condo. You might prefer to pay extra to discourage empty investors, and that could certainly be written in. Even without that, you might also ask how many of the other buyers are pure investors or otherwise ask people how they like it there.
Though, it seems like a condominium complex that is 50% empty would give you a greater density of neighbors than a SFH suburb that is 50% empty. And you can get the Chinese to pay for your new roof, to boot.
Somehow I doubt even the Chinese have enough money to turn a high-density city into a scene from 28 Days Later, though.
Anecdotally, I lived in Coal Harbour in Vancouver when I first moved here. The newest waterfront condos were ~30 stories tall, and on average, you'd see three lights on at night in them. It's not like that everywhere here, but it is really strange.
But what happens if you just chop down SFH and rebuild with higher density, and you don't also put restrictions on investing in the new units? You just end up with the problem we have now. We're building tons. Our local GDP is largely based around real estate. Not that we don't have a NIMBY problem — but there's only so much building you can do before you look around and feel like you just built more empty houses for people who don't live here.