Hmmmm, Ice Age comes sea level drops 400 to 700 feet.
I can see plus sides here.
Getting the ‘off shore’ oil and gas gets a lot easier.
There will be a lot of new land to homestead
Todays beachfront property will be cheap.
Shipwreck exploring by car.
Not if the deed is worded such that the ocean edge of the property line is at the mean high-tide mark. In that case, the property area would increase hugely.