Well in my opinion, bitcoin will never be equal to gold because gold has physical value and represents for the whole economy while bitcoin is just numbers. One possibility for that to happen is we lose all our gold
Despite the physical value of gold I think the store of gold as wealth may not be as secure as the store of bitcoin. Also travelling around with gold could be a bulky task. If more companies accept gold and bitcoin equally as means of exchange for goods and sevices, I bet bitcoin will usurp gold. You wouldn't have to travel to where a company is to get a commodity/service. Who doesn't want a smart and simple life?...lol.