There is plenty of cheap, available housing in the hinterlands of Canada. And yet, nobody wants to move there. Why do you think that is? Prime locations are scarce no matter how much land mass you have.
Canada has a deep labor shortage in its urban areas, with plenty of pent-up demand for growth.
It's certainly true that if we must perpetually conserve each and every single family home in an urban area, then we'll remain housing-constrained. If that's what everyone wants to do, that's their right, but it's necessarily going to result in lower income and living standards for the country.