I think no because bitcoin is used for online transaction and the price of bitcoin is not stable, but if bitcoin become stable maybe it might be possible that bitcoin will become currency, but for now, there's no chance that bitcoin will be used as currency.
The other reason every country have their own currency so where do you think the country of bitcoin?
Bitcoin is decentralized and we couldn't just credit it to China or other countries as their currency.
Yes I agree with you because if you are investors you can see the bitcoin price now is not stable but I think in a long term the price might be stable.
The volatility doesn't really affect ones ability to pay. Moreso, the budgeting behind the funds used to pay. We have had some serious scaling issues, and aren't quite out of the woods yet. But the volatility doesnt really affect the protocol much. It was made to operate through a range of coin prices, and does so pretty well.