I am pretty sure that most of people around the world are already aware about the existence of Bitcoin and they're just refusing to adopt it due to either fear of technologies or just not really up to something new especially when we're talking about money.

A user here has a good point that there are also lost Bitcoins already and a surface research gave me that there are around 4M of Bitcoin were lost already. With that figures and how high of the price of Bitcoin we got these days, there could be just a miracle for some people to even still buy Bitcoin when it starts becoming scarce. Not every country is US, so even people in third world countries like mine might struggle getting a fraction of Bitcoin let alone a whole Bitcoin.