I think in the future the value will not be determined by any government but by the world economy as a whole.
The value of Bitcoin is determined by the market, by the people who are directly involved in it. The demand of Bitcoin is the main reason why there is growth in its value, unlike our traditional fiat currency which is directly determined by the banks and the government agencies involved in the monetary system of the country. There will come a time when Bitcoin use is going to boom in the whole world not because the governments are ready for it but because the people demand its use.