I think there will be 5% of users of bitcoin by 2020. It takes a long time for people to trust him and be able to make transactions using the Internet.
I would be surprised if more than 5% of the world owns that much by then. Because most of the world is rather poor.
Yes, in many countries a bad economic situation. Many people are sorely lacking in food and they do not even want to hear about bitcoin.
I know the economic situation is grave in third world parts of the planet, but Bitcoin is a way OUT of this problem. The number of people who are finally able to feed the mouths of there family where there was once starvation is astounding. Bitcoin has empowered the globe to thrive, even the poorest segments can finally start to get more out of our time. It is awesome.