Whatever cryptocurrency is not convenient and useful for society, we still cannot do without ordinary national money. As a matter of fact, the matter is not even in ordinary people, although some of their categories will never switch to the exclusive use of cryptocurrency. No state will ever give up their national money in favor of decentralized cryptocurrency. As long as there are states with different conflicts of interests, we will not be able to switch to cryptocurrency. This will be possible only when a single government exists on Earth.