my opinion is that Bitcoin has no effect on a country and is unstable too so bitcoin cannot become a global currency. therefore the government must pass laws that can regulate bitcoin from all possibilities or crimes, such as money laundering, theft of bitcoin and others.
If you people believes the decentralization and volatility in nature of bitcoin was the reason bitcoin can't be a global currency you are wrong. I believe that the Libra coin not been supported by the governments and the institutions despite it was said to be centralized and have fast transaction confirmation should be enough understand that I'm right with what I just said.
Volatility and decentralization are the two important factors that make bitcoin more valuable. This isn't understood by majority of the users, if this goes centralized it'll be same as the currencies that undergo inflation. Here we have got the limitations that gives value with regards to the need. So it has the complete setup to be a global currency, but in real life implementation it takes time. Maybe after few generations this will happen.