Currently we only have 0.1% of the population so it will grow regardless. The "masses" are not yet involved in 2014.
more like 0.0001% of total population
I was assuming 2 million users now and target penetration of 2 billion users => 0.1%.
It is true that most of the 2 million are not really "using" bitcoin now, so we cannot yet directly observe how world-changing Bitcoin is. This "land-grab phase" is designed to take us there.