I agree more or less government will move to cashless society that does not require a lot of wasting of hashing power . And i never see even in my dream that government will be using bitcoin to replace fiat money, instead if they plan to create one , they will create a unique cryptocurrency for their own country, more probably no PoW or PoS is needed. They always want to be in control. Bitcoin people should know the fact that bitcoin will never be accepted as national currency of a country.