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?
I believe Bitcoin will be adopted to all of the people in the world at least 10 years to come, because as we always said "Bitcoin is the future of money". If we keep introducing Bitcoin to the people and make them interested in it, then maybe it would take a less time to occur.
Yes. Spreading bitcoin must be the easiest way to have bitcoin in our daily life. If we really want to have a bright financial future due to /with the bitcoin, then every bitcoiner must spread awareness of bitcoin adoption to rest of the world.