i do not think so. to me as still hardly 0.5 percent people may be using bitcoin, so it is not such an easy job that in next few year all the people of the world can use bicoin, i think it will take decades so that all people of the world start using bitcoins.
true what you say that it is very difficult to reach that amount. especially in a period of 6 years to come. this time even though compared to the total world population of more than 2 billion people, of bitcoin users would be less than 5% of the total population of the world