I could be mistaken here but I don't believe the price of gold (relative to USD) has ever halved. Ever.

Now the gold price has, historically, been more stable than USD so there have been times when USD deflated so fast that the relative value of gold dropped by more than half over periods of a few years. But there were very few of these and this is not what's been happening with Bitcoin.

So, if you were comparing Bitcoin to gold as a store of value, you're not even vaguely close.