I think archival cinema preservation will be the factor that determines the continued production of large amounts of photographic film. It's already clear that the marketplace has decided that it doesn't care about the analog preservation of still images, but movies are a different matter. The financial stakes are high.
Digital archiving of movies presently involves an expensive, laborious and (so far) endless cycle of copying and migrating from one format or medium to another, with a resting period of two to five years. Analog archiving is a relatively simple process of passive safekeeping and monitoring, with a resting period of many, many decades.
Whether the analog film is color negative or positive, B&W monochrome or CMY separation, it is currently the superior method of archiving a serviceable copy of a movie. A digital copy may be an exact clone of the original source master, but perfect is the enemy of the good when it comes down to a digital duplicate that can't be decoded vs. an analog duplicate that's dirty, moldy or discolored but viewable.
Is it possible to develop a high-capacity digital image storage method that is passively archival to the extent that film already is? The big movie producers are in the driver's seat here. If they want it to happen, then they will make the attempt. So far they have not, but if they were to succeed, large-scale photographic film production would vanish for good.
In the meantime, from a long-term cultural perspective, it is worth preserving the single remaining Kodak film line in operational condition indefinitely, even if it were only to be run once a year to produce a single batch of archival movie film. I don't know how this idea would work out as a business model for Kodak Alaris, but I do know what the current Eastman Kodak management would think of it.