That's a great interview in the link btw. Highly recommend. Wozniak's comments about the evolution of ground penetrating radar coupled with more efficient methods being devised to mine gold.
Can't deny that the evolution to look and mine for gold is being improved. But He should realize that gold is naturally occurring and none renewable source of substance. Let's say that they improved it. He should understand that creating gold from a naturally occurring materials are not efficient to produce more gold in the next years. We can say that there are still untouched resources out there but once all of it are depleted we can't produce more.
They have same case with Bitcoin and people are more easier to cope with it since digital now are being imposed. I agree bitcoin is on the lead here but when we arrived on the scenario gold is already depleted then countries will definitely panic and some might hoard. Gold has more use case than bitcoin and that's the time gold will spike more than bitcoin but this time bitcoin will definitely win it more due to hype.