I am sure the year 2020 users bitcoin can reach 10% of the population of the Earth. Although currently many countries that prohibit bitcoin but the popularity of the bitcoin will not be stopped.
Lol you too much, you should know that the total population of the earth is so large and while users of bitcoin is still very small, impossible in the next four years we will reach 10% of total users. it is too big expectations
not only that but also bitcoin can not handle that many users. right now with the current number of bitcoin users (which is far smaller than 10% he is suggesting) blocks are full and people are stuck waiting for confirmation. and anything bigger than this is not possible and i don't see how in 4 years we can handle 10% population of the world.