If film were to disappear, cease to exist, or if the Film Police were to enter (forcibly if required), every home, building, store, warehouse, etc., and confiscate every last scrap of film in the world, would I stop shooting film? Probably not. Because there would emerge an underground of secret film shooters, folks who, anticipating the end, would have hidden in cellars, caves, or wherever one can hide stuff, gobs of film, paper, chemicals, etc. There have always been underground systems, created by humans as the need arose, and many have done quite well.
But what I have just written is a scenario of government repression, and we all know governments don't do that sort of thing.
Frankly, I don't see how film can disappear. As long as there's sufficient demand for a product, someone will produce it.
But...as generations pass, and all those who loved film have passed on, demand may indeed wither and, finally, die.
Then I'll switch to digital.