This goes against the very nature of Bitcoin itself. The whole purpose of the cryptocurrency is to be a decentralized currency that is not controlled by any governing agency. I think you are assuming that only positive things would come out of a government's regulatory use of cryptocurrency.

     Entangling the success of a cryptocurrency with the success of a government imposes many risks. Cryptocurrency needs to stand alone on its own merits. Governments are prone to war, shifts in power, and corruption. Only because cryptocurrency is not backed by any government agency, it can outlive any governing body.