It's going to be a very, very long time before there's an actual shortage of land in America. Take a flight from New York to San Francisco and look down the entire time. Just an endless expanse of...nothing.

The only thing that changes within the span of a decade or even a single lifetime is desirable vs undesirable land. Purchasing property isn't as much of a "sure thing" as everyone believes. Housing prices are dictated mostly by local policy and speculation rather than physical space.