In my opinion, the government does not allow the central bank to disappear, because the central bank is the backbone of the government, and they can not let their spine be taken away.
Yes it is true, in my opinion crypto is a digital asset whose existence is on the internet, while bank loans are owned by the government in the real world, so crypto and banks will always be there side by side. But the government in the world will be good to legalize Bitcoin, because bitcoin will not interfere with your FIAT currency.