Well, I answered all those questions with that historical link.

The gold price  didn't go to zero: it simply devalued for a 150 YEARS!
So, gold can hyperinflate and did, in the way that Bitcoin can't.
And those who weren't close to the gold spigot, were rather affected by gold hyperinflation for several GENERATIONS!

As for AI being able to make asteroid mining financially viable, few thought less than a decade ago that practically everyone would be able to afford to interact with AIs routinely now, including an AI they create and own.

Here's a an AGI timeline assessment by an actual AI security expert:

What Bitcoin Did: The AI Revolution That Ends Humanity | Roman Yampolskiy

Episode webpage: https://www.whatbitcoindid.com/wbd958-roman-yampolskiy

Media file: https://feeds.fountain.fm/UZSKQcrOnhqYS1JopxGg/items/Z8XduDM9uV7AdDnwid4a/files/AUDIO---DEFAULT---3e8de1de-8e18-47dc-924b-041baa2b1e29.mp3