In an ideal investment portfolio it is necessary a percentage of 60% of gold and 40% of other type of investment (or bitcoin 
).
).If everybody thought that way, gold would go through the roof.
On a serious note, what people think of as "ideal portfolio" includes stocks, bonds, real estate and a small amount in alternate investments (commodities, crypto-currencies, etc)
There seem to be a deflationary collapse in process. Holding cash, however illogical it seems today, may be the wisest course of action.