"We've already seen that central banks are attempting to co-opt digital currencies. The fact that the Japanese and Russian regimes have voiced some support for the use of bitcoin is hardly a surrender on their part, but likely a part of the regimes' efforts to figure out how they will take control of a new technology. After all, neither of these regimes are particularly notable for thier laissez-faire leanings.
But can the regimes succeed, or will the technology pass them by?
Many boosters for bitcoin and the blockchain often seem to assume that the bright minds behind these technologies will never help the state undermine them. History usually tells us exactly the opposite."
Read further: https://mises.org/blog/what-do-governments-want-bitcoin
I think it's obvious governments will try to control cryptocurrencies. And if they can't then simply introduce their own by force.