Legalization is a very long process, we ard talking here about the whole world and not with a single nation. It is very hard but let us just take it in the positive way. May the legalization make BTC becomes useful and popular.
Many Asian countries have legalized it but again some of its big supporters like china and Russia have made some move against it in the past while they were big supporter of it once so it is difficult to say who is going to legalize bitcoin and who is not. Also, nobody knows for how long will a country support this currency but many businesses are accepting it and it has been praised by all great tech tycoons. The love of people for bitcoin is increasing and that is all what matters
China and Russia just temporarily against bitcoin, did you know the latest news regarding the cryptocurrency condition in Russia, they do make their own CryptoRuble. Russia make this to prevent from any crypto users avoiding taxes and you know what? It means that they do allow the usage of bitcoin as long the users always comply with the regulation and pay taxes.
same goes for china, the exchanges there are now already resumed and everything is going fine.
The same thing will be happened soon in Vietnam, the government is going to ban Bitcoin and cryptocurrency in next year cause they don't have enough ability to control Bitcoin to avoid it's taken advatage. In Vietnam, a lot of HYIP organizations are taking advatage of Bitcoin to scam people. Beside a lot of crime trying to use cryptocurrency to evade taxes.