I think bitcoin has not really defeated gold since the gold market was larger than crypto-currency market right now and the users of gold is more than the user of crypto-currency. Bitcoin just passed gold in terms of price but it didn't defeat it yet and I guess it will never be since bitcoin is seen as an investment opportunity by many, not as a currency that can be used to pay online for services.
I would even disagree with this statement, if bitcoin had passed gold in terms of price it would have exceeded its market cap and its not even 0.3% of it (physical market not including leveraged paper contracts)
Total physcial gold market cap = $7,412,468,544,642
Total bitcoin market cap = $20,219,997,543
And thats not even counting the Comex 145:1 leverage paper shit on top.