What makes you think that gold and cryptos will be a safe heaven?
What if all financial assets (digital and non-digital) are hit by the crysis and their prices crash?
During the great depression there wasn't any safe heaven asset that will maintain a stable price.
The big crysis will first hit countries like Italy,with their huge goverment debt and problematic banks.
Countries with billions of trillions of dollar in debt will be the ones who will be hit the most if a financial crisis takes place. And people will find other ways to salvage what asset they have and find a safe haven like gold or cryptocurrencies and the first one to get or the first user will be the ones that will benefit the most as assets will flow like crazy into these markets.