a small (narrow use low monetary base) currency is highly susceptible to speculative attacks and thus highly volatile and dangerous to both traders and capitalists (=those accumulating capital nor USA folk in general as Europe thinks:D) ...less to the individual consumer ....
for example if you wanted to shake the $ you could bend over backwards for Obama and it still wouldn't change shit ....USA GDP2011@current prices =15.09 TRILLION $
while crashing the national currency of Moldava (GDP2011 @current prices = 7 BILLION $...this goes for a shitload of small countries !!!) would be a child's play for ANY FORBES top 10 individuals or companies ....
need me to elaborate ?

Point is ...BTC is still a small unstable market ...but if people would move to it massively ....well: value, GDP ,market cap they all rise corresponding to the growing demand ...ultimately stabilizing with each small growth ...