I think some nations already welcome Bitcoin and there will be no need for government to outrightly ban the use of bitcoin. So if one nation is critical of it, users in that nation will find a way through the internet to byepas that nation regulation. Bitcoin traders will always find a way around the internet to do their investment except the internet is shutdown.
A lot of nations already welcome's Bitcoin years ago and this isn't something new in here. Governments do not have any power to ban Bitcoin at all because it is a decentralized Crypto Currency without any central government controlling it. They can regulate its use but totally banning it is impossible for them. The only way they can do it is by shutting down the internet to the whole nation to stop connecting to the outside world and that's another impossible thing o happen.
Hats off to Satoshi Nakamoto for making such a powerful digital thing.