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