For hiking trips, you can carry and shoot lots of film but carrying battery power and flash memory for that much shooting in digital would not be tenable. Cheap microdrives and products like the digital wallet have recently solved the storage problem, but the battery one remains. However, the better battery packs are able to do 500 shots which should satisfy those who are not on remote hiking trips. And they can't buy film either. Cost This is the most interesting issue.
Film costs lots more per exposure.
And about 7 cents for a lab to develop it. If you want prints they are anywhere from 4 cents at a CostCo to 50 cents in some location. I shoot rolls of 37, which means it's 23 cents to develop and scan. That's hard to beat. Digital has a very low incremental cost, the battery power and flash memory usage.