I actually thought about that quite a lot.
Assuming bitcoin takes off and 1 USD of today equivalates to 0.000001 BTC, then, as you say, some people are extremely rich (about 1000 people?).
My thought is: "So what, what will they do?". Who are these people? Should we envy them? I tend to think they are "good" people. So maybe these people will act as a kind of "Free Private Reserve", selflessly using some of their Bitcoins to do (maybe necessary) regulation of the money "supply" that is currently done by the central banks. Maybe these people are the Central Banks of the future (the FED is a private bank, too)... after all, they don't have to worry about their personal well-being and some of them own such humongous amounts of money that they can easily inject some into the world if needed.
What do you think about that?
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That would be kind of them - but we can not count on that. But i think it is not a huge problem - it is almoust same right know or worse. I like that bitcoin is independet and almost uncontrollable (very rich people can play with currency with sell/buy transactions) and I think it is what money should be like, if it is needed at all.
And as Grondilu sad, if bitcoin value rises, then
bitrich ones probably sell a lot of them and buy some willas and airplains or spaceships in that time
Does anybody know, are there any bitcoin milionares right know? Am I right that first million bitcoins were generated in short time by small group?