Short term yes, it will be a huge blow if that happens but long term there's no way they can fully stop BTC and that kind of moves generates a Streisand effect and more people will start turning their heads towards this. CBDC's are just a desperate attempt at competing with BTC, and once people realize this hopefully they'll turn a blind eye to fiat.
ES will suffer short term, I wouldn't be surprised if outside forces are trying to dump the BTC price to support the IMF narrative...