Agreed that were all making assumptions. From what I have seen from most reports are that Professional is the largest end user( by revenue), followed by Prosumer and then hobbyist. Content Creator/Prosumer may or may not be grouped together depending on where you look. As mentioned Content Creator is the fastest growing group based on revenue.
I think the problem with those analysis is that there are no well-defined boundaries to separate hobbyists from prosumers from content creators. So it is difficult to establish what category goes up or down.
I don't disagree that the hobbyist market is going upmarket as well. That was a core part of my argument. My macro view was that the bottom of the market is being eroded to smartphones and the Chinese and the Japanese camera makers are shifting toward more premium products rather than trying to compete head to head on price. For example Full frame is gaining ground. So if smartphones and the Chinese are making more and more small sensor cameras the Japanese are making more larger sensors.
Agreed
A hobbyist will be less likely to upgrade without a real meanigful upgrade. And we are hitting a point to where for the casual shooter they may never need to upgrade. I argued for example 8K tv's are declining in sales. So if we never surpass 4K displays as mainstream why would we need 12k consumer cameras for example?
Well a lot of "gearheads" upgrade regardless

Personally I tend to skip a generation (both with cameras and phones) but I haven't followed this rule recently with drones. I tell myself that the newer ones are a clear improvement (they are!), but the reality is that my drone flying / filmmaking skills are such that the previous generation was not limiting me

But I wanted the new ones, so...
Contrast that with the prosumer/professional where they are beating the crap out their equipment and can benefit from minimal new feautures as they are getting paid for the content they produce. As a result they are going to cylcle through equipment at a faster rate through either upgrade or replacing worn out items.
While I do not shoot day in and day out, the main reason I am looking at a X2D II is that my H5X is about to give up the ghost. The X2D II also has a CMOS sensor and ok AF, which make me overlook the painful (to me) fact that I will be downgrading sensor size (from 54x40mm to 44x33mm

).
But apart from mileage, most pros I know are more sensitive to workflow improvements than camera-specific improvements (like resolution, AF, etc.) so they are more interested into accessories, software etc.
Just saying that there are different dynamics that may affect photographers in different ways.
Now of course the future always throws something crazy at you. I wouldn't be surprised if they figure out how to put AI and some other software in the camera and then tie it to a subscription.
Well color me uninterested

I'm all in for smart AF, but call me old-fashioned, I want to be in control of the photos I take.