If the population of this country stopped growing and started shrinking, a lot of real estate would be freed up. Demand for housing in the densest cities would drop, and it would be cheaper to live.
Real estate prices have gone up for the last hundred years because there are more people. This is why it has been an effective and predictable model for businesses like car dealerships to always locate on the outskirts of cities and wait for the city to come to them, sell the land and move further out.
There isn't anything nefarious or even strange about it. It's a natural result of population growth and increasing demand that consistently (so far) outpaces supply. Nor is it inevitable; look at China. Tons of empty apartments, cheap bordering on free to live in. That's what happens when supply outstrips demand.