Just like today, film is dead in many of its forms. Film and painting has become a niche and that's it. It will remain that way.
Who has ever produced a digital masterpiece ?
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I look at it as something I enjoy. If I can ever make a little money, that's good, too, but I'm mostly in it for me. I figure the more I and others shoot and print, the longer it will be around. So if you like film and want to keep shooting it, doing so has more of a chance to make that happen. I'm about to buy a brand new 4x5 soon, too, and I'm fairly sure I'll have film to use with it.
Congratulations, one master roll of film base can be 51 inches width (Kodak's standard width) and a mile or more long. Your choice of analog film proved to those who risked making the master roll that one more person approves of their work. You get to vote with your money. It is what drives every corner of the economy. The coin of the realm you spend on anything is well tracked by everyone who understands that your dollar, peso, euro, pound sterling, creates jobs. Jobs which pay real wages. Economy is the money people have to spend as they like, not for required necessities of life. Enjoy your voyage in analog. We appreciate your vote of confidence in our corner of endeavor. The multitude has gone digital the same way that they went to simple cameras that were the key to Kodak's success. The market has returned to the 'serious about analog' people size. There are 3.5 times the world population as there was when mass market film began. That is a bit bigger market than Kodak and others had to work with. Don't worry about getting the start perfect... just enjoy the start and the voyage.
And for your information some folks in this world think there can be such a thing as a digital masterpiece. I believe that the #1 and #2 most expensive photographs used digital means....regardless if these types of art meet your or my taste, they are masterpieces to some....regardless if we think "piece" of X or Y....
I choose not to comment re what I think of these works of art, because our OP has a legitimate question, not a question of "what is art"....
If film becomes unavailable you can spend the time reproducing the negatives you have already shot in different ways.
I have an uncle who is a world class photographer. His manual analog camera skills are incredible. He creates spectacular images in b&w using very very old Hasselblad and Nikon Equipment, Weston or Lunasix exposure meters coupled with his accumulated knowledge. Assisting or just watching him work in the darkroom making amazing prints off of expired film, long-expired fiber based paper, is like a religious experience. One day I asked him why he never crossed the digital line. He simply told me "because I know, I understand and I love analog." He mentored me. He still does. He's 89 years old.
On another day, he asked me why I drove a 47 year-old Ford pick-up truck and a 72 Mustang convertible. I told him "because I know them, understand them love them and their respective mechanical processes.
I've been a photojournalist for 41 years. I do corporate image work and documentaries, mostly in black and white, all on film. I never crossed into the unknown realm of digital photography that so many were so quick to latch onto. I stayed pat and rather than modifying my equipment and techniques, found substantial uniqueness in marketing and promoting myself as a film shooter. I've carved my niche out shooting with film not pixels. Art directors, ad agencies, marketing directors, illustrators that I work with retain me not simply because of my photographic vision but because of how I record and present them. I still work with commercial printers and supervise press runs. I love doing what I do and I teach as well.
So to answer your questions, my advice to you and anyone here or someone who calls attention to my old Nikon F2As or Leicas or Hasselblads is that if you love something be it a process or a machine or an inanimate object like a camera or meter or the smell of darkroom chemicals, the texture of fiber based paper, then love it passionately and unconditionally and be proud to show your love, respect and admiration for those things. While you gather new knowledge of those things from others, share your own knowledge of those things you like and love with others. Stay in the moment.
Don't worry about whether or not those things you love or even just like will be around in the future. Enjoy them, love them for what they are now. Live in the moment. And don't ever be reluctant or afraid to drive old cars or trucks if you know, understand, love and respect them.
Take it light ;>)
FWIW (and truth be told, its not much) my take goes like this:
The making of photography film is a very mature, very well understood process. The only real risk to ongoing availability (meaning into the indefinite future) would come from a lack of availability of some of the precursor components. As long as those components (I'm thinking about the various industrial chemicals/emulsions/whatevers that go into coating the film) are available, film will be available.
How ever small the market becomes, there will be manufacturers who want to serve it. It may very well be that film turns into more of a "craft" industry, with small shops making product in small batches.
And I can see availability getting squeezed from the bottom up in terms of format because of packaging: 35mm is harder than 120 is harder than sheet. Maybe sheet film, produced by craft shops in small batches is what the future of film looks like.
But as long as you can buy the substrate and the precursor chemistry at reasonable prices, there will always be film.
I skimmed the other responses and didn't see this so my apologies of someone mentioned it, but I think it depends a lot whether we are talking about black and white or color. Color transparency is already in its death throes. Print film will last a lot longer but the selections are already down to a few, albeit wonderfully excellent, emulsions. I'd be worried about it too eventually.
Black and white is so much easier to manufacture in small lots that I am unconcerned. Besides Ilford, whom Simon called "robustly profitable" there are also small companies like Afox and Foma making good products. No worries about B&W IMHO.