I do not believe that exactly bitcoin will become the official currency of any state. Most of the coins found are already owned by whales. For the national economy, a more flexible cryptocurrency is needed.
I believe Bitcoin is a global Crypto currency in future because future Economy is positive in all the country so we expect the official currency. We are move to the updated technology so we just follow the same way. But some countries are creating the restriction at the same everyone supporting to crypto platform automatically they will accept the new trend.