Not almost everyone but merely 98% is using bitcoin on that year.because in this era we are living technology is rising,and by the help of this bitcoin will be more popular in every year that will past.
Lol I do not think it would be that high. The world population reached 3 billion people over while you can see just a little bit bitcoin users in each country. how is it possible within 6 years bitcoin users can rise 100-fold? I think it is impossible. because deployment bitcoin can be fairly slow