Bitcoin becoming world currency means it's no more decentralized and it's never going to happen, Nakamoto never created Bitcoin to be the world next big Fiat currency, it was built to give freedom to the adopters against centralized entities, Fiat is the government currency and Bitcoin is the people's currency, thats why it's fully decentralised and the government will never like anything decentralised anyways and it's cool.
yes I agree with your words.
and indeed if bitcoin is made into ordinary currency it seems that it will be difficult because of the unstable price of bitcoin.
because in my opinion bitcoin would be more suitable to be used as an investment asset only. Because
if it is used as fiat currency it will definitely be difficult.
if used as a means of investment would be good.