In your thread subject, you make it seem like it is something that we're already experiencing, then you go on to say it would take sometime in your op. I don't know in what way you believe BTC is already surpassing gold, but in terms of marketcap, BTC is still ~10 times behind that of gold, and that would take some covering.
It's not hard to imagine countries who like to hold gold, start to hold Bitcoin instead, obviously such a prospect will take some time but I strongly see it happening, and I'm not alone.
Gold is a safe haven asset and even if we have heard talk of countries looking to set up a BTC strategic reserve, it is gold that most countries hold in their reserves and continue to stockpile on the precious metal.
Just recently Binance CEO actually echoed my sentiments. We Know when CZ speaks, he speaks from knowledge and then people surely would start to take note. One thing is certain here a lot of persons can actually see that Bitcoin could be a much better asset than gold.
That would depend on the subject i believe, cz once said 99% of people would probably lose their BTC stored in self-custody, encouraging them towards custodial storage.