It may happen in very far future. But we first need to kill real paper money I guess.
it doesn't happen in far future because bitcoin is virtual and Gold is tangible so bitcoin is not as gold standard.
That doesn't mean nothing. Bitcoin is totally identifiable. That mean that can be used as unity of measurement. Then have to many other qualities which make it a good competitor in this field. Don't exist any kind of possibility to be manipulated during its production. Everything in this action is ruled by the peer to peer and not from the desire of the will of someone. It can be developed and improved about every kind of weakness that can be discovered or created in time. Not only this but can be defined even its story and movements since its born. Other data this about its impossibility to be manipulated. So, this so totally identifiable "item" like is bitcoin, is much more credible as a point of reference for every kind of currency than every other subject. Including gold which very rarely exercise even this role about which is point of reference - so we have as a point of reference for the currencies something which rarely is currency (rarely use this role). It is like use the "meter" to measure the "weight". Not totally so but near, yes.