I dont think so. In the end game Gold is still a precious metal and a beautiful thing in the eyes of a person. Bitcoin is a different story as it is a very good way to make transactions so as for the better currency the bitcoin would be best of two as for my opinion.
Yes for me it wont happen. Bitcoin and gold are different to each other and they have their own charscteristic that the one have. Even bitcoin was more valuable when it comes to price still gold will not be replaced because it was a thing that all people in the world accept. Remember not all people are supporting bitcoin. Maybe bitcoin was a good way to make gold but that doesnt mean that it can replaced it.