It all depends on what you mean by "mass adoption". Did gold achieve mass adoption? Even in the most developed countries like the US only up to 12% of people own gold, and most of them just own some jewelry and not actual investment gold. Does that mean gold did not achieve mass adoption?
Even if just 5% of world's population owned bitcoin that would be an incredible rate of adoption for a technology this young. If 10% of world's population owned bitcoin that would be IMMENSE adoption. Bitcoin is a technology which use is the store of value. Mass adoption doesn't mean everyone owns bitcoin - only that people who actually have any value to store use bitcoin to store that value.