Interesting article, but I don't think that the Central banks will give up their monopoly on money, Central banks will in 30 years probably hold bitcoins just as they hold gold. But I don't think that we will see the government paying salaries to their workers in bitcoins.

Private banks that hold bitcoins will probably have a better credit rating than banks that don't have any bitcoins. If banks one day going to lend out cryptos it will most likely be crypto from a blockchain they control. This way we cut end up going back to the old time where every bank was issuing their own currency.