Actually even by 2020 IMO, many will be using bitcoin, but it doesn't guaranty that mostly will be using bitcoin, everyone would still prefer the currency in their country for convenience. Just like us, we are collecting bitcoin but we sill prefer to convert it to our local currency for ease of use. I'm afraid that institutions and businesses that uses bitcoin can't cope up with the increasing users in many countries, they might come later on.
There are still a lot of people that is holding now and they think that they can earn some more money with it later in the future.