I don’t think that this is always true. Land reform happens consistently in history when ownership gets out of wack. Also the value you assign to the land is going to change when the use changes, for example houses in currently popular tech hubs aren’t as important when people can work remotely. And the improvements to land like houses aren’t always going to necessarily hold their value. Labor is a huge influence on price, what happens when machines start building houses? Not saying you shouldn’t buy land or houses, I consider them part of my strategy but consider the downsides too.
Oh yeah, take a look at the Georgists and The One Tax where land is the only thing taxed since it’s the only finite resource. It’s not impossible that we end up in a situation where holding land just to hold your wealth isn’t going to exist anymore.
This has historically been true, but one major variable has changed: executives have been forced to see what their companies look like with remote workers. The land and housing markets look very different when a significant percentage of people aren’t paying for a shorter commute.