It looks almost like a challenge: we have photosensitive materials manufacturers having an hard time satisfying demand and the two major camera manufacturers retiring their line.
The camera manufacturers have no interest in the film manufacturers. Why would the former care about the latter?
Also keep in mind that both Canon and Nikon have lots of other markets and applications to serve, and to distribute their resources over (incl. engineering). It doesn't make a whole lot of business sense for let's say Canon to move engineers from making equipment for flat screen LCD production to a complex electromechanical product that only a handful of people purchase.
The truth is that neither Nikon nor Canon are
camera manufacturers per se. They're diversified companies and one of the things they do is about cameras. For Canon, the imaging group constitutes about 20% of their revenue. Only part of that is related to cameras in the sense discussed here. It's a relatively small part of their business. Nikon is a similar story; imaging products is around 25% of their revenue, and again, cameras (and lenses) are only a part of this segment. And I think we don't even need to touch upon the topic of digital cameras (in whatever form, including surveillance, video etc.) still being massively more relevant economically than film cameras.
If businesses like Canon and Nikon would divert substantial resources to something like film cameras, investors would balk - in the face of markets like healthcare, energy, semiconductors etc. that are massive and show consistent double-digit growth, they just can't justify a hobby project. Pentax, being shielded from the outside world at least from a financial viewpoint, apparently has managed to create a sandbox in which they could do this (Japanese dislike of conflict/confrontation may have helped, as Ricoh might have been hesitant to take any action against it).
I guess what I'm saying mostly is that you need to see the bigger picture. As photography enthusiasts, we're liable to framing Canon & Nikon as camera companies, Fuji and Kodak as film manufacturers, etc. In reality, they're so much more than that. The companies that really focus on film photography are very few and far between, and they're very very small.