Harmonization is what will enhance the existence of the cryptocurrency, this will only happen when government globally has a stack in the decision making for this to work out, thou crypto is still evolving and this might not happen soon.
Do you think it will ever happen in this government setup? They are in line with allowing criminals run away with people's money and they dont care about the common people's money. The government propaganda is just to make sure people dont get out their control and so they wont allow people to ever transact crypto in peace. Unless there is some huge economic overturning of tables, we can forget about any harmonization.
Fiat being totally regulated it would be tough to control crypto in a similar manner. There are a lot of difficulties that we at this point cannot forsee but can hope for the best.