People will not accept it legally until you get legal recognition. It's a digital currency. Governments basically do not recognize its holders because their identity is complex.In which country, how much tax will be charged, how much exchange value will be? This is also a big question. Paper currency depends on the economy of any country. This kind of amendment has to be done in bitcoin . It is quite expensive. So how long it can be a legal posture unless it is completely accepted by any country or government!