In order to use bitcoins you need internet and not everyone uses internet . Most of people don't know how internet/computer works so maybe its the main reason why Most people don't even know what this is yet. For knowing or starting buying selling bitcoin, you need to have basic know how of the Internet so how will those people operate and use bitcoin who are totally uneducated.
that is not the point, we are living in the world where internet have been the primary needs just like you need to eat. so i think in most places internet available already , the point are when even a classy full of technology store won't adopt a new big thing like bitcoin.
they could do it easily btw. just the matter of time to make them convinced and feel not fear using bitcoin with its volatility.