There will be no gold standard.

Gold is an archaic relic.
Why do we spend so much time and energy digging this stuff out of the ground only to store in deep dark caves?

The only thing that gold has over cryptos is that it is physical.
But, people today don't really care about physical. It just has to be somewhere they can always get to it. And a few more iterations of crypto technology and it will be there.

So, the other use of gold? Making jewellery.
How many necklaces does each woman need?