You have a point. For me,  many people had already know what is bitcoin. Others know bitcoin but they do not engage their self in this thing because of some reason. But to tell you honestly I don't know yet the exact population that know already the bitcoin.

most of the people around the world knows bitcoin already. it has already publish on public media like television, social media and other media platform.
I guess not all are interested and most of them don't care about it.