Considering the supply vs global population = 0.003BTC per person to go around.
Then other factors like not all 21 million will be in circulation due to lost wallets/deceased hodlers who never informed anyone where their seed is, and also an increasing global population and future generations who all want in.
Do you think 0.1BTC will be like owning a mansion?
Mansion in my country with current price need at least 2 Bitcoin. Because in town a normal house can cost 1 coin and it is right depends on what country and location of the house. My house if price now need 0.3
BTC at current price, maybe if price can increased x2-x3 from now, people who hold 0.1 BTC can buy house in village because still cheap.
120k For an entire mansion? Which country do you come from, may I ask? I cannot imagine anyone even building a mansion for a mere 120k... Just the building expenses alone would (should) cost more than that. And then you would need to buy furniture, kitchen, and stuff... Even in the deepest part of the third world that seems too low a price to me. But perhaps you are thinking of a big house, not a mansion?