Here's the thing. We're not Zimbabwe. We're not Venezuela. We're not the Weimar Republic. If the US Dollar utterly collapses, gold isn't going to be worth [excrement], either.
What will be worth having? Defensible arable land, crops, ammunition, the ability to create antibiotics from scratch or set a broken bone, breathable atmosphere and most of all, potable water.
Gold is the lazy prepper's hedge against a Mad-Max dystopia. Preppers in name only who don't want to do any homework. "Well, I have guns and gold. What else could I possibly need?"
Most gold coins do nothing other than take up space. And if they truly were the be-all-and-end-all of investment vehicles, nobody would willingly sell it. They would horde their bullion like Scrooge McDuck. Instead, we have a cyclical trade system where overpriced gold is sold to people who think the world will collapse. And then the gold is repurchased at a deep discount, only to be resold to the next person who has read too much Ludwig von Mises.
Not only do I think that gold isn't a good investment, I don't consider it an investment, period. The only thing I would do with a ton of gold (if I were to find some hidden in a cave on my farm) is sell it and use the proceeds to invest in something that actually appreciates and pays dividends.