I think that the biggest threats to bitcoin are not the central banks but the governments. Nowadays central banks are under governments' full control and do whatever the governments tell them. Even the CBDCs are introduced and are likely to be enforced by the governments and not the central banks. The original demand for CBDCs came from the governments who were afraid they would lose control over the population. so the governments demanded from the central banks to come with a something that would help them counter the spread of BTC as a way to make payment. Then the central banks came up with the idea of CBDCs which are pretty much the old bank (electronic) money under the disguise of crypto/decentralized money (and in fact they are neither of these).
So the governments want to keep the old fiat system that allows them to keep the people under full government control. Regarding BTC and other crypto money, the governments want to keep them as fully-transparent commodities that will be traded on exchanges for those who want to invest or play on the market. The recent regulations (AML5, AML6, MiCA, etc.) do everything possible to put crypto under strict government control, essentially defeating the purpose of the crypto as a payment method.