I think bitcoins grows more widely it has more advantages than banks or other sources. It is like a government facility and can enjoy in bitcoins. 
That's why governments and big institutions will not allow bitcoins grow in wider range. They try their best to limit bitcoin growth.
Governments will either try to pass more and more licenses like BitLicense or will try to start their own cryptocurrency.
I think it would be a great game changer in terms of currency and adoption, but I don't think so many people trust the government, a lot of people realized the potential of that level of power and often see people freely exploiting it. Apart from that, I think that all the govts won't make such a move together, and don't even think they will use same currency, so every country will have its own crypto which is weird for me to even imagine