The reason for this is that Fujifilm (maybe also Agfa-Gevaert and the Chinese, I don't know) use the same coating machine(s) to coat motion picture film, still photography film, paper and maybe other materials. The demise of motion picture film would not in itself make the rest of the production economically unviable.
The Kodak case is different. As explained by PE Kodak has its coating spread among several (two or three? I don't remember) coating facilities. One is devoted to paper (and is located in the UK going by memory), one to film. The coating facility in Rochester coats IIRC only MP film and photography film. For that coating facility the demise of MP film would pose, is my understanding, an industrial problem.
What is interesting to note is that for Fujifilm and possibly other producers production of slide film and negative film will be economically viable even in case of MP film not being produced any more because photographic paper and other products will go on being produced on the same facilities.