This is a remarkable number when compared to the total number of Bitcoins that will ever exist. While there are roughly 35 million millionaires in the world, there will only ever be a maximum of 21 million Bitcoins. That’s right--there will never be enough Bitcoins in existence for every millionaire in the world to own even a single one.
What’s Bitcoin’s long-term potential? Bitcoin could easily become so valuable that even millionaires can’t afford an entire coin.
Have you counted the amount of Satoshi's that would be available? Do you know that even a Satoshi can be sub-divided if the need is there to do that? We are dealing with "code" and this code can be changed to adapt to the need. Sub dividing a Satoshi, will not make any difference to the total supply of bitcoins, it will just give us more units to work with.
100,000,000 Satoshi = 1 Bitcoin ^smile^
dividing up bitcoin any further will NOT happen unless in a very extreme circumstance. it won't happen simply because it is a hard fork to change something very fundamental and it will affect bitcoin a lot. and also because there is no need for it and there won't be.
that extreme circumstance can be (if i recal correctly Satoshi said this) in case a very large amount of bitcoin is lost for sure. like 10 million coins sent to a burn address!