I do not think selling all gold and trading btc is a wise decision for a simple given fact that gold will exits even tomorrow but btc you do not know as its not governed by any authority or country may change its policies against this currency.
What's been quoted is all about the unpredictability of bitcoin. But bitcoin as the potential investment gives you the profit in a very short term than gold or other forms of investment. I won't think that bitcoin gets vanished in a short or within a day. Without doubt you'll get assured earning for the gold you sell and invest with bitcoin.