As long as Bitcoin is super volatile it will be used more like a store of value and less like a digital currency. Also Bitcoin can't have worldwide penetration because there are communities living in remote locations with no good Internet infrastructure and no Bitcoin exchanges so it will be impossible for them to buy or sell Bitcoin and no merchants will accept that as a method of payment. Bitcoin is on the right track but still it has a long way to go before it's accepted worldwide.
The main problem is that investors will not or do not trust bitcoin as a worthy investment since they see the volatility.
Volatility tiself is not bad, but in the case of bitcoin it is caused by market manipulation which is why the majority of the investors keep away from bitcoin.
People wont invest because its volatility are you sure?Lets look at gold ,its a lot volatil as bitcoin and people keep investing trading it all days,sure bitcoin is just digital but the market wanna bitcoin,otherwise wouldnt be big miners into it,and would be worthing 6 bilions dollars at the moment.
I see bitcoin as a international currency already as there are people from several countries here earning and using bitcoin already.