No country will give up its absolute power over the issuance of money. That would mean politicians, banksters, and taipans would have to give up their power.
Never will be,
not unless we decapitate them with technology. And Bitcoin can't be it, it doesn't have anonymity.Bitcoin cant become currency for your stated reason. The majority of bitcoiners believe it will.
I agree with the bolded statement (in part). However no cryptocurrency will ever be anonymous and thus become currency. If somebody has a hugely successful business and no transactions are shown in yuan (at his local bank account) (or any other government currency) it will be obvious that he is using cryptocurrencies instead of yuan.
EDIT: I believe bitcoins price will collapse as I dont see Bitcoin being used as a store of value (or as a currency as explained above).