:)Countries are divided into 3 groups: those who ban bitcoin, those who will regulate it strongly and those who will give complete freedom to development. The second and the third groups us well be satisfied with. This majority. It's enough to survive.Therefore, it is not necessary to look for negative outside of us. ; 
In the future a new breed of cryptocurrency will be born. Decentralization will be out of the picture and private entities will no longer be the king in this industry. The future industry is controlled by the state and the central banks. Governments are now planning to create a digital currency using blockchain technology wherein they will control and is not market based.
decentralization will never go out of place, it will continue to be that way. decentralized feature is something people want about cryptosystem, its the one of the biggest difference from other form of payment. On the other hand, I agree that the government will make move on making their own kind of coin. Since they get nothing from the government, they have to make a platform that will get something from the holders.