Considering the supply vs global population = 0.003BTC per person to go around.
How did you arrive at this mate, thought if the world population shared the available bitcoins we could be getting less than 0.003 BTC .
21,000,000 (total bitcoins) / 7,000,000,000 (world population) = 0.003
BTC.
Broadly talking, OP is right in his calculation.
0.1
BTC looks a pretty decent amount of money in that scenario. Even if only 50% of total world's population adopted it, a tenth of a bitcoin would be already enough to live confortably while generating passive income from the total sum of coins. That is why people should focus in getting bitcoin at all costs, doesn't matter if they are going to be able to have 1 full bitcoin or not. Any fractions of it will worth a lot in the future.