These Doomsday Preppers Are Starting to Switch From Gold to Bitcoin

Again, it's always prudent to spread out one's currency risk, whether conventional or alternative.

An all-in approach may reap spectacular returns short-term (e.g. Bitcoin), but could prove catastrophic long-term (e.g. USDollar).

Another point to note is how crypto-currencies can be used by financial media to slam gold, the ultimate store of value, even if it's not an ideal medium of exchange.

https://www.bloomberg.com/news/articles/2017-11-20/can-bitcoin-survive-an-apocalypse