It will never be of any use when all nations create their own cryprocurrency and I actually do not see such thing to come and as such if that be the case then things will fall apart as we see a lot of national currencies just at the mercy of the US dollar. And if it possible bitcoin will still be the control of all crypto market.
Of course anyone cannot control or control the price of bitcoin to become a reference for altcoins. All independent cryptocurrency, depending on the market, will move up or down. The government cannot intervene, but can make regulations that limit the area where bitcoin can be used, an explanation of the business fields that bitcoin can be used as payments, etc. The aim is that as a payment instrument, Bitcoin has legal certainty.