I think maybe Bitcoin can replace traditional money, for reasons such as convenience, so no need to exchange local currency while traveling, keep fast and cheap transactions, as well as currency deflation, with Bitcoin people can also make their business more profitable.

only some countries in Asia consider Bitcoin illegal, I think the reason why Bitcoin is considered illegal is because Bitcoin is a virtual money, it is easy for Bitcoin to be misused as an illegal transaction, which is very detrimental to society and will disrupt the financial stability of the country.

in some countries there are already legalized Bitcoin as payment transactions, but there are some countries also that have not legalized Bitcoin. Hopefully the future of Bitcoin can be recognized in all countries and be used as a legal means of payment.

the reason the government is afraid of Bitcoin might be because of the many crime cases involving Bitcoin, and Bitcoin is a decentralized digital currency, an unstable Bitcoin value, and uncontrollable.

we should not rely on Bitcoin, because Bitcoin is a digital money whose value is unstable, may invest in Bitcoin but don't be too hopeful and not too big, to note also the risks before we invest in Bitcoin.

I do not think it will probably be used as a world currency, because of the rising and fluctuating value of Bitcoin, the beginning of the goal of creating Bitcoin as a digital currency. But it does not rule out that in the future Bitcoin could be used as a coneventional currency.