Bitcoin remains to be adopted by every country in the world for various reasons. Here are my thoughts on why..
1. Government policies: Most government and financial institutions round the world seem not to want bitcoin cause of the financial freedom it gives to its users. They would want to control and tax the flow of finances of individuals and they probably fear the anonymous nature of its transactions. Some policies even go as far as criminalizing its use.
To me the biggest obstacle in bitcoin adoption worldwide is oppression of centralized institutes backed by governments. The main reason why government is against decentralized bitcoin is that they won't be able to control it. Its not true that criminal activities like money laundering can only be done via cryptocurrencies, right now majority of criminal activities are going on with fiat.