At any time, the rots-children and the rocky-fellows could individually dump enough gold on the market to send prices through the floor.

The price of gold could return to its intrinsic value, that of a rock. A nice, pretty, shiny rock, but a rock none the less.

Bitcoin has surpassed gold in price.
Bitcoin has surpassed gold in usability.
The only qualities gold has left is tangibility.

And, for the most part, the western world has already given up the tangibility aspect. Plastic is where its at. Which is quickly being taken over by mobile phone purchase apps. And if there wasn't so many govern-cements / bankers trying to do all kinds of bad things to their money supply, no one would even think about gold as an investment.

Gold has long been used as money. And every gold bug will tell you that gold has intrinsic value. That its price will never go to zero.
Here are a few ways that gold could go to $0

The Total Supply of Gold is Actually Much Bigger Than Expected

It is very easy to imagine a point in the near future where China will jump out and say, "We have all the gold in the world!"

(meaning, they will say that they have umpteen tons of gold, where the number given is near the known quantity of above ground gold.)

And then the vatican, and the FED, and the Rots-children will all come out and say, no, we have all the gold in the world. Suddenly, over night, there is many times more gold than any expected. More than even the Golden Jackass (www.roadtoroota.com) believes exists. And he gives many detailed reports of hidden troves, both known and rumored.

There are also many untapped gold mines in The US. (Grand Canyon, Black Mountain...) Thus, it is easy to imagine that one day we wake up and find that gold isn't as rare as we thought it was, with an accompanying precipitous drop in price

Acquiring New Gold Becomes Easy

There are several technologies, that if successful will make new gold acquisition trivial and create a supply that is far in excess of demand.

Imagine a water purification system that used nanites to grab onto all the ocean salts in the water. Then the nanites are pulled out of the water by magnets to release the salts and be reused to create more drinking water from ocean water.

Well, there is a lot of gold in ocean water. And such a system could pump out gallons of gold.

And that is not the only technology for gold extraction in the pipe.

Gold Is Confiscated

This would mean that the legal price of gold would go to $0.
But, it also means the black market price of gold would be...

For countries like The U.S., anyone who kept gold would keep it buried. There wouldn't be much of an exchange here. There would be very little black market, if at all.
But for countries like India, there would be a huge black market. In fact, it would not be surprising if the entire black market was gold based transactions.

And since confiscation of gold is a last ditch effort of govern-cements to get some income, it will probably never happen in The U.S. as there really isn't enough gold floating around in people's hands to be worth the effort. But it could happen, reality and stupidity have not stopped govern-cements before.

The Masses Tell the Bankers Where to Stuff It.

Imagine all the banks saying that they have all the gold, and lording it over the masses. And then the masses say, we don't want your gold, you keep it. And they go off and use barter or bitcoin or something else, and no one accepts gold as payment for anything.

If you want food, grow some food and swap with your neighbors for any and everything you might need. But, if you don't grow any food yourself, then those that do will find you untrustworthy and you are going to starve. (you could always eat the gold...)

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All images in this post are my own original creations.
However, the gold bars in the images came from https://pixabay.com/en/gold-bars-feingold-bank-1013618/