Can't and won't - just because you're comparing two completely different things.
Gold is not just a tool for investment. This is also
1) technical material
2) decoration
3) minting of commemorative coins
and other applications for billions of people.
What about cryptocurrency? That's it. Much smaller user base.
The final value of a thing consists not only of its price but also of its general demand. So I don't think that one day cryptocurrencies will become more valuable than gold, I'm sorry