Nowadays, the problem is - we can't use btc as a circulating medium, because it's terrifyingly relatives. Today, we can expect the situation - btc has lost 400$, as a reason of hacking the exchange. And it's ~2% loss, and if you want to buy pizza, you pay 10$ today, and tomorrow you pay 11-12$, because it's difficult to synchronize price of bitcoin and pizza:D
I hope it is clear, we should stand by for another cryptocurrency, and it must be stable coin, imho.