If we were to go to a 100% bitcoin currency system. The banks and governments would loose control of whole financial system. The present governments would loose control.
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I do not agree, the government has full control, only by making the rule that cryptocurrency is prohibited then we cannot fully use it freely. In this case, the government cannot stop the widespread adoption of cryptocurrency, although it is full of pros and cons, the development of cryptocurrency has many benefits and can overcome obstacles in transactions and other matters related to the financial system. So the government controls it by providing certain policies.
Imagine the concept of democracy, the power is from the people but with that power, they still need to select a leader that will maneuver their country. The same with cryptocurrency, even if we have all the power to regulate and serve as the new body of control, we will still consider having an entity to lead the way to organization and control. Basically, the regulation will be outside of our scope, thus, making transactions possible abiding laws and rules set by the constitution.
That is the fact. We can only follow the rules. Limitations are not the end, we just need to adapt well and take advantage of this opportunity as much as possible.