People settling in different areas of the US isn't really a big deal. Very little infrastructure is expected to last a super long time.

There is overall plenty of land.

Some people that chose poorly when investing in land are going to lose money. Big whoop.

(Don't get me wrong, I'm a green, but we don't really sell this all that well, moving is pretty easy in the US, and people that own land in flood zones are basically lumped in with smokers when it comes to violin playing for risky behavior by everyone else. Living (purchasing land...) in a climate risk area is a choice).