So I would estimate the current number of bitcoin users at 1,500,000 at the bare minimum, and more likely closer to 2.9 to 3.25 mil.
That was also my original estimate, but it is unrealistic because then most of the accounts would need to be too small to be bothered.
None who reads this has a small bitcoin balance, but do you even know of people who have, say, less than BTC1?
Edit: thanks for the info.
I need to process it carefully.