I do think that crypto-currencies are a better safeguard than gold.
Of course, in a Mad Max world, the internet will not be functioning but, I think that gold will also be useless in that environment.
What will be of value in a Mad Max world? Food and the means to get it.
>>> “A few hundred thousand dollars worth of gold held by a single individual isn’t not as easy as say storing $300,000 worth of BTC.”