How many times have you heard someone say this about land? They just aren't making any more of the stuff.
Don't tell that to the people of Holland.
Or San Francisco for that matter. Some of the "most expensive" land in SF was "reclaimed" from the bay. It seems that we had this event happen in 1849. Some fool discovered gold near Sacramento. All the sailors on The sailing ships tied up to the "embarcadero" jumped ship. Many of those ships never left San Francisco. They just rotted where they stood. Hundreds of them in fact. Eventually, this entire area was filled-in creating all that valuable real estate down around Fisherman's Wharf. Read the whole story here.
And this manufacture of land is still going on.
In my neck of the woods (San Diego) we have a rich tradition of filling in the bay. The entire area bayward from Harbor Drive is all man-made land. The Convention Center, the Marriott and Hyatt Hotels, and SeaPort Village are all on land that didn't use to exist.
Do you think we're done yet? Hell, there's a lot more water out there. 

The latest plan is for a major creation of land in an area of the bay just off Chula Vista's J Street Marina. See HERE for all the details. You may even want to participate in this land creation. San Diego Bay is beautiful, a marvel of nature. If you let these guys have their way, it will be even nicer. 