For something like this to happen, you need mass adoption of Bitcoin worldwide, 4 years is too short. Gold is acknowledged by everyone to be valuable, it is something tangible that even people in their 80's or older can easily recognize. Bitcoin is a new generation thing and at the moment attracts only people that are technologically savvy. When we've reached a point where the oldest person on earth was born after Bitcoin was created, Bitcoin will have been universally assimilated. Of course we might not need to wait that long 
Today came the time that will determine the future of cryptocurrencies. All known restrictions on the use of Bitcoin in some countries at the legislative level. At the same time, the United States is very much discussion of the future prospects of cryptocurrency development, give positive feedback when using Bitcoin. The EU authorities said that they plan to tackle trafficking in cryptocurrency and try to regulate it. The main initiator of the future of cryptocurrencies is the German Central Bank, which not only gives recommendations on the use of cryptocurrencies, but also discusses the prospects for further development with other Central banks of Europe.