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 .
Do you think 0.1BTC will be like owning a mansion?
For now its not possible to own a mansion with this amount of bitcoins but there will come a time when the world is no stranger to these digital currencies and maybe see cryptocurrencies being legal tender which should drive the demand and price up. If bitcoin will still be around after 2 decades or so I see it to be worth a fortune.