Eventually... cryptocurrency will become mainstream...  The banks and government are starting to look after the benefits of cryptocurrency.  They have been designing regulations and law where cryptocurrency can be used or integrated in finance industry without breaking their core point about finance, centralization. 

Although Bitcoin is decentralized in nature government wanted to have control not on its main network but rather the company that utilized Bitcoin to gain profit. I believe eventually, the government will create such regulations and cryptocurrency will then become a mainstream. 

Whether we like it or not, cryptocurrency needs government support in order to become mainstream.  Aside from that, I believe there are lots of works and development that need to be done on the Bitcoin system for it to be ready for mainstream adoption.