Cash is backed by the military force and economic heft of the country issuing it. For an alternative to exist, it must first and foremost be able to hold its value reliably and that is precisely the niche filled by gold.

Crypto will never fill that void.

> hold its value reliably

It can and that's what it exactly does by keeping its value outside the reach of external influences such as military forces and economic decisions by a handful of people but only governed by its own mathematical law.

It's just that people don't understand the nature of crypto but only see it as a new risk asset class which is disappointing after its 13 years of existence and it's the only reason it's going up and down massively by people not having the fundamental belief of what it's actually about.