It's a realistic scenario for illiquid assets like art and land. Antique roadshow has real examples filmed on camera.
By this same standard, maybe Amazon is doing an immense service to humanity, and that is why so many people use the site daily, and actually enjoy doing so. So maybe Bezos should get to keep his billions as well.
Currently, gold retails at $1808 an ounce. So it would take over 15.6 metric tons of gold to be even worth a billion dollars. That is substantially more than an "old pile", and probably of historical worth, like contained in a ruined temple or wartime vault or something
The San Jose galleon as I mentioned is estimated to have about $17B of gold on it. I don't think very much is going to change about the world when it is raised.