I bought a $1,200 Kodak camera back in the mid-1980s and still have it. The odds of film being available in twenty years? There might be a South Korean company around making it, but for developmental purposes....I don’t see any US company by 2025 that you can get your pictures made.
I would guess that black and white film and associated developing chemicals, print paper, and so on will continue to be available as art supplies.