The problem using BitCoin instead of fiat in contingency environment is the volatility of the asset...couple that with limited access to the internet...and there are real problems with a crypto based economy. Further, getting around sanctions, which are often established through UN not US agreements...those things are enforced by military intervention. Simply using a crypto based currency doesn't work...there is a price to pay, and that price might be the receipt of tomahawk missiles, increased instability and the loss of access to ones wealth...and even when the wealth is accessible, the economy may not be equipped to receive it.