What you just said is not an enough reason for anyone to be talking about central bank of cryptocurrency. And by the way, what the heck is central bank of cryptocurrency? Why do we even need bank for cryptocurrency, wallets can already do the jobs. Cryptocurrency wasnt meant to be kept in the bank, its for you to keep it by yourself. Cryptocurrency puts people in charge of their money, you save it yourself and you use it anyway you like..
I think banks and crypto are totally different and there is no way to merge them. One thing is for sure, if banks tries to merge crypto, eventually it will be the end of banks and fiat itself. So i don't see any such possibility in the near future.