Film isn't dead but it's certainly a niche hobby like using a spinning wheel to make yarn or restoring antique cars. When there are no more antique cars to restore or film is no longer made then they will be dead.
Ah. So basically like the hobbyists here with interchangeable lens cameras instead of smartphones.
But more seriously, some feel that the film bubble (as in financial bubble; film cameras are amazingly expensive now for the hot models) will burst. It's not like antique cars (since every year a new batch of cars passes into antique-ness), more like rotary phones, in that very few new film cameras are being made (Lomography, Polaroid, Fuji). Although new films have come out and have been resurrected. These do well...now. Quite well.