Just to put another slant on the idea. There have been ups and downs in the world of photography and the demise (almost) of some chemical and material manufacturers and the resurrection of others, although under a different banner.
In the long term it may well be the lack of suitable equipment, and by this I mean cameras. They will only go on for so long until they wear out. With only a few new models being made that use film, the Nikon F6 and the Leica rangefinder models coming to mind, plus a few others originating in China.
Medium format film cameras are not available new anymore, as far as I know, but luckily there are plenty of 2nd hand ones around which at the moment seem very cheap to what they used to cost.. Large format models are still available new, but in what quantity and price? Not every one would wish to lug about a 5X4 or larger, plus the mandatory tripod. Spares will be getting few and far between and as for electronic models, this will mean eventually they are a seriously threatened breed.
What has happened to all the Pentax screw thread models that must have been made and sold since they first came onto the market. very, very reliable but unless you are lucky there are very few (comparatively speaking) on the used market so what's happened to them. This is just one example
No I don't think film, paper or developers are the long term problem, it is what to use it with