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People buy gold to hedge against equities and bonds. Gold owners have obviously started buying Bitcoin too to hedge against gold, for what it's worth. Just have a look at the graphs showing the outflow from gold into bitcoin during the media frenzy in December.
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While Bitcoin may share some use cases with gold I highly doubt that the overlap of gold bugs and Bitcoin hodlers is quite that big yet.
Besides, where the hell do you see "an outflow from gold into bitcoin"? The gold price has barely moved last year. It actually has slightly risen since the beginning of 2017. Apart from a small dip the gold price has risen during most of December.
So I'm sorry to say, but cryptocurrencies are not quite there yet. Bitcoin might become a more widespread alternative to gold in the future, especially for a younger generation of investors, but we still have ways to go and a certain amount of price stability to reach.