So, in order to “make it” you need a mansion? What kind of mansion? There are mansions that worth few hundred thousands of dollars and mansions valuated at half billion dollars. If it's the former, yeah, I do think you will be able to afford it with that amount, in the far future.

I advice you to use a smarter formula than assuming every person uses it, cause that's not gonna happen. And even if they did, I am very sure they won't have 300,000 sats each.

When? In 2030s? In year 2400? In the next millennia? And in which country is this mansion? Because a mansion in a developing country is worth a fraction of a cost of a mansion in a developed country.

There's no minimum amount below which investing in Bitcoin is not worth it. People should be investing amounts that they can afford to lose, not the amounts that are viewed as a goal by others, like one whole coin.

It actually depends on what your definition of "make it" is, the thing is that 0.1BTC is relatively a good sum of money now (in some locations, it could be extremely large, in others it could be really small), and even in the future it could be way much larger. Though it may not be way too much right now, but it's a great amount in investment if one has or can accumulate it. Comparing it to owning a mansion could prolly be wrong cause it may not be able to afford it. To own a mansion you have to work really hard and earn quite a lot of money, and it's not by owning 0.1BTC, but mind you that if you've been able to grow a portfolio to 0.1BTC right now, then down the lane in the future you could accumulate the amount in Bitcoin that could afford a mansion.

0.1btc now is the same value as 25 btc back when I started in crypto. Iff we go as well as we have done, it should be a nice amount to keep holding.

Of course, if it's the maximum of affordability, you could always go lower - 0.01-0.05 are still worth 2.5-12.5btc from 2015 prices.

The mistake of many people is to over-calculate and speculate with calculations without speculating with the actual action of buying it
Don't take the time too far in last year alone, if you count bitcoin it's been very profitable. maybe there are still many who are complacent waiting for the right time but then regret it later

Hmm this is a tricky question but as someone who believes in long-term HODLing, 0.1 BTC MAY be enough for a person to buy something decent within 5-10 years from now. Imagine, the price of BTC back in 2017 was around $4,000 and no one expected its price to reach $54,000 after 4 years. Imagine the potential of having to wait two to three forks- its price may definitely skyrocket in the near future.

With every fork having to further divide its flow of supply, there is definitely that potential of 0.1 BTC being an insane value in the future. But if I were you, continue purchasing for long-term HODLing and you will reap its benefits in the future.

I think the answer to OP's question will depend on the timely. I mean, the entire bitcoin supply emissions isn't completed yet and we're still far from full crypto adoption so I imagine that when we get either or both of those too - total supply in circulation (not complete 21M considering missing wallets among other things), Bitcoin's price might be at a place where 0.1BTC would be enough to actually "make it".

Definitely it's like owning a valuable property nowadays, and that 0.1 btc during those day of 2017 was not a big deal compared today. But for now, it's really an amazing profitable amount to generate bigger gains once it earns passive income specially when you're proficient with day trading and other crypto investments.

How much does a mansion in your area cost?
Because we cannot generalize it for all countries. It will depend on each area.
If that is in my area, no.
0.1BTC is around 5700$ if converted to Usd Or yku can also convert it to your country fiat.
It seems that I cannot buy a mansion or even a small house in my area, even it is a subsiditory house, still cannot.
If I have 0.1BTC and I want to have a mansion or house, I kust work hard again. At least I can buy a land at first, but it is of course not too wide land. Enough with only around 80-90ft.sq.