~snip~
Gold continues to reach new ATHs, while Bitcoin's market prices are relatively stagnant. As a matter of fact, prices have declined due to Trump's on-going trade wars. The beloved cryptocurrency is far behind from its last-recorded ATH. I consider it hard for Bitcoin to surpass Gold. At least, in the time-being. Things might change in the long run.
I know Gold will keep rising in market price (which leads to a higher market cap), but so will BTC. If the latter increases at a faster pace, then it could overcome Gold's market cap in a "blink of an eye". I'd buy and hold both commodities just in case.

I think this is just a short term noise in the price, really.
In the long term, I clearly can see that Bitcoin will continue to rise.
For example, I can see that when countries start to ask for their gold reserves being held in other countries, and they are not sent, there will be a clear update in Bitcoin, and less trust in gold.
That's just one example that I think will happen in the next 5-10 years.