100 BTC could take care of the full money supply of an entire country if it got popular enough. Easily.
Please give a thoughtful answer, you did not answer what would happen after btc supply stopped expanding, yes price would rise, btc would become divisible and only a few would have whole btc. What stops the economy from becoming lopsidedly deflationary?
We don't need to stop that. Seeing as we'll hit the cap over a hundred years in the future, likely by then Gaven will have put in a change to sort this problem out(ex. adding 8 more decimal places) or Bitcoin will be overthrown and replaced with something better. Hey, will any of us live to see a single Satoshi having accountable value?
This is what I don't get from the general proponents of BTC why do you think adding more decimal places will solve the problem? That is not increasing supply. This will have no effect on fixing the issue. It's like saying I want to buy an apple with $1 usd, but it will be cheaper if i use miniUsd which is $0.5 usd instead. Seems as though everyone is on the same page by saying hey we will just add more decimal places, yet I have not had a simple explanation as to how this would solve the problem. Think of the demand supply curve.
Nobody complains about million dollars being too expensive. They just use dollars instead.
If the price of bitcoins goes up to 1000000 dollars, only idiots will complain that they are too expensive, the rest of us will just price things in uB (microbits) instead.
I don't think you have clearly defined what "the problem" is. The divisibility of bitcoins solves the granularity problem that would happen if bitcoins were deflationary but not divisible. Sort of like what has happened with gold - try going to a store and buying an apple with gold, what are you going to do give the clerk a couple flecks?
The underlying "problem" of having a deflationary currency is unrelated to the divisibility issue. Look through these forums, there are plenty of discussions on why deflation is not necessarily a problem.