Bitcoins volatility is currently too large to rectify and even begin approaching gold as a portfolios favorite reserve position. This is not to say that gold has not experienced lows and highs, but investors like gold because the likelihood of golds price changing significantly is much lower than that of cryptocurrency.
This is one of the main attractive features of gold. It is a good way to store wealth, particularly in the face of uncertain international markets when fiat currencies are less solid. Bitcoins high volatility may be one of the larger barriers to transcending gold entirely. Furthermore, just because Bitcoins price past golds doesnt mean Bitcoin is worth more than gold. In fact, in order to match golds market cap of $7 trillion, a single Bitcoin needs to be worth around $500,000.