Land will always be scarce because it isn't quantity of land (though that too can be a separate issue) but quantity coupled with positioning of land. Most people could afford to purchase four acres of land in Alaska or VT's north east kingdom, but four acres along central park is quite expensive because, due to the location of the site relative to all the services of NYC and the access to greenery, it is rather exclusive... and I don't believe (including references from all the SciFi I've ever read) that there is any situation society could be in that would nullify the difference in value of two parcels of land - Judge Dredd and Mega City one I believe come closest, even though land overall is much more of a limited supply, most of the inhabitable land is equally worthless - but there are still a few Oasis of dystopian high society around that have vastly different value.

If we draw even to Hitchiker's Guide's concept of built planets, and we considered the cost of making planets would eventually trend to zero... there is still the concept of locality that would influence price.