Hi !
We can't compare sheet film with watercolor or canvas. Film is made using heavy industrial processes depending on a set of very different materials. (bone gelatin, chemistry of silver and coloring agents, plastic... etc... )
So if one of these raw components disappear, film is gone. If the regulations about nasty chemicals evolve, we could loose film (think about the demise of cadmium in the B&W printing paper).
So we will one day, loose film. This will arose gradually. We will loose one manufacturer at a time, and forced to use the small niche maker in the suburbs of nowhere... Then we will have to convert to collodion or other historical processes. Provided the chemicals will not be banned....
As per a digital back in very big size, I do not think it will see light one day. Too few customers, and the possibility to use shift lenses in smaller sized gear will prevent the giant digital back to show.... Look at the medium format digital backs available. Who will pay that much money for a hypothetical gain in printing size ? (and this gain comes at a huge price because you've to get huge computers to process the images with huge RAM and processing power....).
Things change and evolve said the Buddha.... So will we ;-)
P.S. I've seen young people very attracted by my Sinar Norma and very excited to learn that view cameras can still be bought new... Hope, there is hope.
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