Then what was the purpose of Bitcoin at the first instance, It was introduced to curb centralization and explicit control of the government over native currency, Any cryptocurrency introduced by the government will about nothing but complete centralization as the name implies to Govern "Conduct the policy, actions, and affairs of (a state, organization, or people) with authority." Why would anyone want this ?
I think this issue will not become a reality, the government already has fiat and one country will not use 2 official currencies