Bitcoin doesn't need mass adoption. All it needs is peeps who are buying and not selling soon thereafter. In this way, some percent of coins is constantly being taken from circulation, and the remaining coins inexorably grow in price, giving a false hope of the price rising "again and again in the future"...
Excellent investment strategy - buy, hold and hope
I don't agree that, we need mass adoption to realize the purpose of bitcoins. It was created not to make the investors or trader rich but it is for the benefits of the people to shift with a more secured and low cost in doing online transaction.
As you know, the road to hell is paved with good intentions. But so far Bitcoin is just that, i.e. a vehicle for making investors or traders rich (at least, some part of). Mass adoption as you mean it will first make these profiteers yet richer since still more users will pursue even less coins...
Either way, all roads lead to Rome