:)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.
I'm 99% sure you're right because the technology is advancing every single second and the more sophisticated it becomes, the more it is likely to give birth to a new type of currency, like 'quantum/cyber/digital/crypto/who-knows-what' kind of currency that might already be in the pipeline and we are not even remotely aware of that... 1% of my uncertainty accounts for a scenario where BTC evolves and adopts new technology, in which case it'll remain the leader forever.