By that comparison, I wouldn't count gold out. Its physical durability is established. You'll have no problems dealing with a 150-year-old coin, but I could s

By that comparison, I wouldn't count gold out. Its physical durability is established. You'll have no problems dealing with a 150-year-old coin, but I could see even things like "paper key/secret" storage falling apart if the appropriate ecosystem isn't there to restore access. Its volatility is far less than BTC. The dollar still does better by that metric in non-dramatic times, but there's the implicit "if you're looking for alternative value stores, you've probably already turned up your nose to the dollar." Offline cash in and out is still easier. Most communities have a coin dealer who will happily exchange dollars for sovereigns, or back. Yes, the spread is probably large, but I'd trust a cash-in-hand transaction with a local dealer a lot more than an exchange who will suddenly go into "we no longer offer fiat withdrawls, have some HappyFunCoin instead mode.