I don't think any country will create a fully public, P2P, blockchain-based cryptocurrency. Instead they will create currencies on blockchain platforms that are permissioned and that can be controlled.
Venezuelan government already created petrocurrency meaning there is already existing country that has own cryptocurrency..
everything can happen if there is a desire, at this time many companies have joined the crypto world, so I think the bank will also issue their own cryptocurrency. Now that technology has developed so fast as crypto currencies, I am very confident that the bank will someday also issue their own cryptocurrency.
Were not talking just banks here budz,it's about Central Banks ot better known banks of the government,next time try to read the whole topic before putting your own opinion