I don’t think a country especially its government would agree to give legitimacy to something they don’t have  control with. Cryptocurrencies is decentralized in nature meaning it cannot be regulated by any other party but it could be banned by a certain country if it get involves in serious/fraudulent activities.

In actual all depends upon the point of view of every government . And in my opinion those countries government like Japan are seeing bitcoin in positivity because at the upper level the personalities that are taken to discuss are positive with the cryptocurrency and if people are having negative thinking at higher level then surely they will give Negative reviews and suggestions and action to work by the government of that country ( exmaple is China , Bangladesh ) .
In my opinion bitcoin has no Negative inflammation except of few cases which can be easily solved by the simple rules and regulations if government wants .
But if any government will try to make any rule blindly then I am sure that only negative impact and Result we will get by every country .

Not all countries will accept the use of bitcoin and for those will it won't be at once. For sure as time goes on the number of countries that accepts and approve bitcoin will be higher than the once that ban the use of  bitcoin .p

It's not difficult to think that within the next 5 years even that this could become a reality.

I think it will still take some more time to get legalized. Banks think of it as a big threat which eventually affects bitcoin to get accepted worldwide. I hope someday bitcoin will get legalized in most of the countries because it can change the world's economy.

Bitcoin is the effective way to decrease time and cost in transaction, however it should be supported by government

when bitcoin can be used in all countries with clear legality then bitcoin can gain legitimacy, it may take time to get it. and bitcoin will be legitimate when bitcoins have very clear rules

that is truth with time bitcoin will get legitimacy in most of the countries mostly in my country we bitcoin have been implemented

Yes, I think that in 2 years, many countries will open the door to cryptocurrency. This only takes a while. The time will naturally open. No government can reject cryptocurrencies. He is a future.