If bitcoin is increasingly legalized as a means of global payment in various countries, it will not be a replacement for gold, but rather an international currency such as dollars. Is that possible? It won't be easy. World governments and banks will not allow their centralized systems to be taken over by Bitcoin which is actually decentralized. Moreover, they can't even control it. So if you want to replace it, this will be very quite difficult

 Meanwhile, for digital investment, it is possible that Bitcoin and Gold will continue to compete. However, Gold is a very valuable investment. So Bitcoin can actually go hand in hand.