Well gold market cap is assumed to be a little over 16, lets say 17 to be sure. I am sure that there are golds in the world that's not in this calculation, you can't know ALL the golds, but this is the assumption at least. Bitcoin on the other hand is not %10 of that, meaning its 1.3 trillion yet. So if bitcoin goes x10 higher, to 650k per bitcoin, that still wouldn't beat gold market cap. For bitcoin to pass gold, we would need a bit over 800k per bitcoin. Which, we can easily say, won't happen anytime soon. Obviously I am not saying that it will never happen, we "may" see that happen one day, just not right now.