That would be a big sign for all cryptocurency, but I think that's something that's impossible because real money will never be replaced by virtual ones, if so, it would be great for all btc owners, and people would realize that btc was not a scam and more invested
The bank will eventually join the crypto trade, because the market is there and the velocity of money is very large, because if ignore the opportunity it can lose momentum. Only regulation is needed, because there are some countries that still prohibit crypto use. In principle, banks are business institutions that must follow financial trends so that they are not left behind by consumers.