some countries banding bitcoin , some encureging , some people say its a replacement of visual currency , some saying its just a scam ...... whats the real future of bitcoin 
Go through this article.
To me, I think in future flat money may be replaced by crypto currency. It may be Bitcoin or ethereum or litecoin or etc. The users of crypto currency are increasing day by day. I don't have the exact statistical data but this much sure that users increased to 10 times before. So undoubtedly the popularity is increasing.