I agree with your point, but I thing I don't understand how current system of nationalization which is divided in countries. Economies of these nations flourish by the demand of product they produce. How crypto will replace all this economic system so early.
I think cryptocurrencies will remain but will not take control of the whole economic activity. Governments are run on stated policies and decied values but in crypto no one will be able to sure what will be the value of any ceartian currency tomorrow. Like in Bitcoin case there are rumers that current down the drain value is due to sudden sale of Bitcoin by MTGOX to settle its creditors.