Canada

You do want it to be fine though, because we don't actually need that much space and some specific things like waterfront/views are vastly different than the average suburb location. As I mentioned before, there's actually tons of space. You don't want 70% of detached home owners to sell their property all at the same time, you want the ones closest to jobs/amenities to sell first, give developers the time to build them up, then slowly push further out depending on how supply and demand for that location change over time. The goal isn't to just pave every single detached house near a city center. It's to make sure that people use a reasonable amount of land given the desirability of the location, or pay everyone else for the privledge of using more.