so you're saying a black swan event might affect the price? gee well Im glad that doesn't currently happen with USD, CNY, JPY....
you can also use bitcoin like a physical bearer asset (gold bullion) by using things like https://opendime.com/ so even if the network was 100% down transactions could still happen IRL. You'd just be exchanging a hidden private key that can move UTXO's on the blockchain.
considering that I'd say bitcoin is much more anti-fragile than a bank statement, in most of the natural disasters you're talking about im not so sure banks will be letting you withdraw any significant amount of $
you can also use bitcoin like a physical bearer asset (gold bullion) by using things like https://opendime.com/ so even if the network was 100% down transactions could still happen IRL. You'd just be exchanging a hidden private key that can move UTXO's on the blockchain.
considering that I'd say bitcoin is much more anti-fragile than a bank statement, in most of the natural disasters you're talking about im not so sure banks will be letting you withdraw any significant amount of $