I agree with those posts predicting that the supply problem is going to be more with film than film cameras. I'm confident my Nikon F, and possibly my FM2n's will outlast me. However, film supply could be more uncertain. Already Kodak appear to have discontinued tranny film, with the result that Fuji have hiked their prices, already Velvia/Provia here in the UK, is priced at £9 per 35mm cassette, and that's without processing charges!.......Thankfully Agfa Precisa 100 asa has been relaunched at a price that used to be paid for Provia. Hopefully they'll continue to manufacture it at a reasonable price.
Rising prices of film and processing materials are the main threat to the future of film photography in my opinion.
I can't remember when I bought a new camera. All the ones I bought have been used.
Actually, I think there is at least one new film camera available in each of the main categories I can think of, except for Point & Shoot. This makes sense since the P&S has always traditionally been used by consumers who value convenience above everything and, despite all its good points, analog today is not the most convenient format - and even here, one could consider the disposable 35mm camera the successor to the P&S (although with considerable sacrifice of IQ).
Entry 35mm DSLR - Nikon FM10 (I hate the use of this name for a plastic camera) and Vivitar V3800N.
Pro 35mm DSLR - Nikon F6, Nikon F100 (no longer manufactured new, but available NOS).
35mm RF - Leica M7 and MP, Zeiss Ikon, CV Bessa.
MF DSLR - Hasselblad 503CW, Mamiya RZ-67.
MF RF - Mamiya 7, Fuji GF670 and 670W (and CV branded equivalents).
MF TLR - Rolleiflex 2.8 FX.
LF - a wide variety from Chamonix, Arca-Swiss, Linhoff, Wista etc.
There's even a MF super-wide viewfinder camera available - the Alpa WA with Schneider 36mm f/5.6, viewfinder and 6x9 back.
So despite the lack of choice in most segments, I think there is at least one new film camera available for pretty much any photographic requirement, if one is prepared to spend the money. Wherein lies the rub, because they are not cheap and most of us prefer to buy second hand given the availability and pricing of excellent used equipment, which in turn makes it uneconomical for manufacturers to introduce new models except in the most specialized niche markets.
I've only bought two new cameras in the last fifty nine years, no wonder the camera industry is going down the tubes :)
Another consideration is who is going to service the cameras when the current repairers have retired or died ?, because it's more difficult than ever these days to get classic cameras repaired.
I was an apprentice trained precision engineer who spent twelve years working in the aircraft industry, I have all the service manuals for my cameras, but the more I look at them, the more I realize that to service them and their electronics is beyond my tools equipment and capability because I know my limitations.