How many folks are settling all their monthly/daily bills today in BTC ? The answer is probably zero. And its been six years already. Sixty years later there is only one way a human can settle all their daily/monthly bills in BTC >> the country they live in has issued their own alt coin which can't be BTC...unless they gained complete control of BTC.
Sovereignties don't control their currencies in the way you think. People only use their currencies as long as they don't break, or something better doesn't come along.
This should be required reading for this thread http://nakamotoinstitute.org/mempool/speculative-attack/