Yes bitcoin is the future of the money because slowly it is spreading all over the world everyone is coming to know about it
It will be a potential future money but the mainstream will not always be with bitcoin. The mainstream will be still with digital currency (fiat) of each country. But a lot of potential that government will choose to replicate bitcoin for the future money. I'm sure that bitcoin will has a position in the world of currency.
No government would drop its national currency. This will never happen. Even a small country whose currency is very low, will support the dollar or euro, because this is an international currency and all foreign exchange aktyvy in them. But paying taxes is also playing against bitcoin.