This is no different than of someone just happens to own a whole bunch of silver, and the price of silver goes up in the future.
Deflationary currencies are not a new thing.
Lots of things that have all the same properties as a currency already exist right now, and have existed for thousands of years.
There are already lots of limited supply things in the real world, and someone can already just buy a whole bunch of it, in hopes that the price will go up in the future.
And if you don't like the properties that a certain currency has, then you can feel free to use a different one.
Personally, though, I prefer using currencies that aren't guaranteed to decrease in value in the future (which is the definition of inflation).
Which is why most of my assets are not USD dollars, they are things like assets, stock, and other investments.
And, as for your specific example, I see no reason to believe that crypto will go up in value, over the LONG term, faster than investments. So in your hypothetical, Satoshi, IMO, would make less money than if he had invested it in an index fund.
Such is the power of compound investment.
You are also using a wired metric. Which is percentage value of dollars.
There are only 1.2 trillion dollars in circulation.
Do you have a problem with the fact that Jeff Bezos could own 10% of all USD in the world, if he wanted it?
We already live in your "ridiculous" world, sir.