What is your opinion: will btc become a currency with which you can pay in supermarkets, subways etc?
Or will it remain a crypto-currency used mostly in the Internet?
Who knows maybe someday in the future this might happen. Bitcoin is been here for many years now and the more the Bitcoin stays the more it grows strong. Lot of developers are creating stuff using Bitcoin. Someday we might see this in the future and if this will happen then it will become an advantage for us who owns Bitcoin this time.