All the counties are accepting the Bitcoin but only disadvantages is decentralized platform. Most of the governments are discussing the Bitcoin legalisation but it is decentralized and transparent platform so government should not control the activities. Once legalised in Bitcoin many regulation is possible in all the countries. Bitcoin will be globalised cryptocurrency in future.
Just so you know, not all countries accept bitcoin as there's some that banned the usage of bitcoin.
If a country adopts crypto currency then it should be backed by something such as gold, oil or fiat itself. Hence, if it doesn't have any backed up then it will be just useless and it won't be acknowledge by central bank. And the essence of being decentralized will loss and it will be replace by becoming centralized, and that's saddening tho.