This is difficult. Bitcoin may become the legal currency of some countries or serve as a value reserve for issuing legal currency. But it can't be every country.

A powerful country cannot give up its control over the economy and finance. This is the lifeblood of a country's development. The birth of Bitcoin has given some countries another choice in the face of failure of macro-control. However, it is difficult for a powerful country to have such a situation.

What role will Bitcoin play when facing these superpowers in the future. I have been thinking about this question, but I haven't got an answer that can convince myself.