Hello Steven,
o.k., no problem at all

, if I have understood you right, you think the total global number of film shooters is not more than about a million.
Just let's check that number with proven, publicly available data:
Some time ago Kodak made the public statement that they had hired 300 additional employees for the film production. And that they are looking for even significantly more (in total 500), but have problems to find enough qualified people.
And 300 additional people in film production is really quite a lot. For comparison: At Harman technolgy / Ilford Photo currently about 200 people are working (due to their latest published data).
Film production is a highly sophisticated, but also highly automated process with machines for mass production. There are several videos published online, mainly on youtube, where e.g. the 135 film format confectioning made by Kodak and Ilford is shown. I have seen the Ilford film confectioning live by myself when Ilford offered their famous factory tour last time (Simon Galley was our tour guide, and did an excellent job).
The 135 film converting lines at Ilford and Kodak have an output of ca. 1 fully finished / packaged 135 film per second.
That makes 28.800 films per day in an 8h-shift. If you than calculate that the line is out-of-order for about a month each year for maintenance and repair (often done during factory holydays), then you have a max. annual output of almost 7 millions films, for that one-shift operation.
Let's be more conservative and on the safe side, and calculate much more time for maintenance, and calculate 6 million films max. p.a.
Almost six years ago, before Kodak hired all the new staff for film production, there was one video of a Kodak factory visit published in which the max. yearly capacity for 135 film in a one-shift operation was given with 12 million units. Means Eastman Kodak had running two 135 film confectioning lines at that time.
Then demand further increased, and at an accelerated speed. Due to Kodak they increased shifts, and additional hired staff were used for additional shifts.
With two lines in 3-shift operation - with our conservative calculation above - we reach a yearly capacity of 36 million 135 films. But do you need 300 additional workers for a second and third shift? No, it is significantly less, as these lines are fully automated. You need staff to "feed" the line with 35mm film pancakes (one person is sufficient for that), for surveillance of the operation, a mechanic / mechantronic for problems / instant minor repairs, and at the end of the line someone transporting the finished films to the warehouse (I have simplified it a bit, so that you get the general picture).
That means that you still have the huge majority of your 300 additional employees left.......certainly some of them were needed for movie film production, for 120 and sheet film confectioning, for R&D etc. But the number is so high (and as explained above, Kodak was looking for even more staff) that it also could be that Kodak was planning / or has implemented an additional 135 film confectioning line.
In summer of 2019 Kodak alone had backorders of 30 million films, mostly 135, and mostly amateur color negative film.
And we know that up to this day from the film distributors that if CN amateur negative film is coming in, it is sold out again immediately often only in hours. So demand is still and currently higher than supply.
From all this data we can conclude that demand for Kodak films has definitely surpassed 40 million units p.a. (135 and 120).
Then you have to add the numbers for Fujilm, which is also a double digit number.
And we know that this demand could not have been fully satiesfied, production was lower than demand (so we definitely have a significant number of photographers who want to shoot more, but don't do it because of lack of amateur CN films).
And you have to add the numbers of Ilford, Foma (don't underestimate them, they are selling quite a lot of film), ADOX, Film Ferrania, Maco / Rollei-Film etc.. That's also combined more than 9 million units.
So in total you get for the period of 2019-2021 a global demand for standard photo film (not instant film) of at least 60 million units.
With your assessment of about one million film users, that would mean that the average film demand / consumption is 60 rolls p.a. per user.
And that is definitely not the case. Film shooters who are using more than 30 films a year are the minority. And with the huge price increases recently the average number is definitely decreasing, and most probably below 20 films p.a.
The price situation on the market has meanwhile a significant negative influence on demand. But that is a different topic for a different time and different place.
Best regards,
Henning