The btc is gaining momentum for exactly the same reason - the global consensus towards the btc is constantly being strengthened. In this case, unlike gold, the cue-ball is not only a measure of value, but also a settlement system, and gold is not a competitor for this parameter.
Technically speaking bitcoins cannot replaced gold because they are just artificially made while gold are not. They might be the prime in yhis moment of time but in the future when bitcoins are not popular anymore gold will still exists and people need gold because gold can also be used as fashion and a lot more not just an investment. But that is great for a long term invest be a in the future there will be an instance that we will run out of gold to mine and the gold we need is im the person who invest it.