It does sound very innovative but i don't think this will ever happen. Bitcoin price is too unstable, it swings in too big price range to be adopted as permanent currency. Permanent currencies need to have a set value, that does not swing as much.
What sounds innovative about that? I cannot see any good benefit when the whole world switch from their respective fiat currencies to BTC as their main mode of payment, all I can see is the unnecessary expense involve in order for this kind of transition to take place. Also what you are asking for BTC to be stable is impossible, for one the government does not have the major control with it and most whales have the biggest supply for it. In anytime they can sell what they have and make an impact in the world market. BTC is not meant to become a main mode of payment and looking at it realistically it never will be.
Bitcoin is kind of 'Internet Currency' and it probably won't ever replace fiat. I hope they both compliment each other to make world a better place!