I do not see the essence of central banks in the bitcoin and blockchain technology. Bitcoin is decentralised and that is a good part of it. Getting a central bank for bitcoin means bitcoin owners will no longer remain anonymous.
Bitcoin does not require a central bank, because this applies to the whole world, as well as peer to peer, where transactions are made online between one wallet owner and another wallet owner and all are anonymous, so that the role of the bank is eliminated. All transactions occur because of price agreements on the bitcoin market, which refers to supply and demand.