A simple thought experiment reveals that if all the Bitcoins in existence were to be distributed evenly across the people of the Earth, then there would only be BTC 0.0023 for each person, worth USD 15 as of this writing on 3 October 2018. This stat is calculated from the world population being 7.5 billion, while at this time there are 17.3 million Bitcoins in circulation.
Bitcoin’s circulating supply has been steadily increasing due to mining but eventually, Bitcoin’s supply will reach the maximum hard cap of 21 million coins around the year 2,140. The United Nations (UN) and United States Census Bureau (USCB) make projections for global population out to the year 2,050 and both suggest the world population will be around 9.5 billion. So if these forecasts are accurate, there will be 0.0022 Bitcoins per person in the year 2,050, slightly less than today.