I'm pretty sure gold's market cap is around 7B$.
The market cap of the largest gold etf, GLD, is ~34B alone. Needless to say that is just a drop in the bucket.
It does seem that BTC is becoming an alternative storage of wealth. I won't be surprised if the price goes that high or higher, but neither will I get too hopeful that we will see such a rise any time soon. Futures market opens soon, which may have a significant impact on price. I am still in disbelief at the meteoric rise this year, so I guess anything is possible.
Like others have said, one of the huge factors is that the bitcoin supply is finite and declining over time. It all depends on how many people want it and how much of it they buy. Fingers crossed!