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.

The idea of land ownership is as mythical as Thor's hammer. You don't own land - you own a right to do certain things on that land to the exclusion of others. Only sovereignty gives actual ownership of land - transferring it to another jurisdiction, setting up your own laws, destroying said land and doing whatever the fuck one would do when one is literally "law onto oneself".

Also - money is no longer representative of a thing you can hold. Money is a share of wealth of a nation, which includes trust, culture, people, land and buildings.

It seems to me that colonizing other planets would only be a viable solution if we first developed faster than light or at least near light speed travel; and those may or may not be physically possible. Otherwise we would just end up with a scarcity of planets within practical travel distance of each-other.

Not really. Even if we triple land use efficiency, population growth will increase the demand to compensate

If humanity lived at the density of Paris (21,438/km^2), we could all live in an area half the size of Texas (695,663 km^2).

So if we're talking about material post-scarcity, land is more than plentiful.

> Land in the non-coastal western US or most of Canada or Australia is theoretically scarce too, but not so much in practice.

If the acquisition cost is >0, it is scarce in practice as well as theory.