As long as people buy (enough) film, there will be film manufactured, even if it gets down to a narrow-roll coating operation (like the new Ferrania) making one emulsion. That film might turn out to be ISO 25 ortho, in the worst case (the process to make that emulsion is public and well documented) -- but that's more or less where we were in 1900, when most cameras were devices one craftsman could assemble in a small shop. An experienced amateur optician could (today, with the patents more than a century expired) make a Tessar for himself (or herself, or insert preferred pronoun here) in a few weeks of full time effort (or a few months of hobby spare time), and with ISO 25 and a slowish lens, you can get away with a guillotine or roller blind shutter. Sports photography will be via frame extraction from 120 frame/sec 8k or higher resolution drone video, by then, as will most photojournalism. Still photography will be a hobby pursuit of the leisure class or a highly dedicated art skill, much like a number of older art forms (oil painting, watercolor, sculpture, woodcarving, etc.) are now and, as with modern oil paints, the materials will be expensive enough one won't fall into the activity by accident -- but they won't be so expensive a determined practitioner can't get started and, with some skill and luck, make a living at it. Or have all the fun they can afford.