Gold has proven its worth for a long time and I don't think that is going to change in the near future. Wherever you go, gold is a relatively known commodity that commands a great value. To compare it with bitcoin which is still at its early stages of development would be a little off. We all know that both has value right now but bitcoin is pretty much still an unknown currency, that is to the general masses.
So was the usd when it was first introduced. And Bitcoin has many more uses then gold has, its only a normal progression that bitcoin will replace gold as gold becomes worthless.