You brought up a point that I had not considered, population numbers say at the year 2100 (estimated to be approx 10-12 billion). So I did some research based on 12 billion. Assuming some similarities to current monetary distribution among populations, the higher end estimate for users of BTC if on a bitcoin standard is 7 billion. The rest are too young, incapacitated or dependent. It is possible that there will be no unbanked people left by then, but there should still be legal and cognitive barriers in place which will significantly affect distribution. It’s possible that with a population of 12 billion you would have a hypothetical distribution of 300k sats per legal individual. Of course this also is not a real use case because none of these projections factor in commercial, sovereign and national accumulation.