There's not much STOPPING people from using btc but the fact of the matter is people are just scared of their ignorance in something so they dont try to learn, they're just lazy and they are too scared to ask people, So lets all help them out lol share what you know with your friends (even if they dont ask) lol.
Yes, there is a psychological barrier. I would also add that people are afraid of the unknown, and because it does not want to develop. Looking for a press conference and promotion.
People who live in provinces wherein there's no internet connection , Because to use Bitcoin we all need internet connection , We need to communicate with others to trade, to sell and to buy Bitcoins.
Yes, it is necessary to establish the structure and functioning of the Bitcoin system. 21, and the internet still does not know how to use it.