Don't forget what Hal Finney predicted more than ten years ago, or rather his napkin math calculation. (TLDR = $10m USD / BTC) Still, that's going to take a few more years (perhaps another decade.)
Not a prediction, more like top limit estimate: the ceiling that bitcoin price
cannot reach.
At that time, which was 10 years ago. In the future, the money supply would, of course, be slightly larger. But who is to say that new coiners would skip fiat altogether ... ... which would imply that it's not going into any M1 or M2 or anything...