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?
why not!
In 2010 who can think that 1 BTC will be worth of $60K?? But over time, that is likely to change. Now, 0.1BTC is worth of $5k but who knows that Bitcoin never go $200K within the next 5 years? If the bull market of Bitcoin continues to grow like this year then It is too much logical to think buy a mansion with 0.1BTC in 2025.
Perhaps, many economists think Bitcoin will replace paper money within 2025, so Hold on tightly until your dream comes true.