It could be argued that gold is priced somewhat arbitrarily, based on market demand as a store of value -- exactly like BTC. However gold is a physical product and has real-world uses as an element.
With all that taken into account, will the market drive them to general parity? Like the Euro/Dollar?
The physical existence of the gold is not an proof that it matches with the same value as Bitcoin. Between gold and Bitcoin have big difference. Gold is a metal that has been valued by people for years, but Bitcoin is a new currency and has a power to determine our future. BTC is currently the best tool to measure any asset value.