this means that there are effectively 2.1 quadrillion Satoshis in total
You forgot that a digital money can be divided into
moreany number of decimals and
the current 8 decimals is NOT a final thing
.
It means, with the current supply, you can serve any number of world population. I guess the time has arrived for innovating a new unit which is smaller than he current unit 'satoshi'. Multiple topics for this had been discussed here. Let's wait for what bitcoin devs will bring on table.if Bitcoin had an unlimited supply like regular Money, it would lose purchasing power and value over time
Will value over the time? I agree but after how long? This is the reason, supply of bitcoin is capped.