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I would imagine that most people would carry an extra battery or two on an extended trip into the backcountry with a digital camera. And if you are going with a vehicle that has plenty of fuel, you'd have a way to recharge the battery.
Your comment about the presence of infrastructure is the same for film. If you get rid of darkrooms, then you have some plastic with silver emulsion on it that nobody can see. You'll be able to copy digital pictures to the next form of storage a LOT faster, more efficiently, and at far lower cost than you would be able to preserve photographs. Incidentally, the very same thing is true for electronic books, versus printed ones.
There will always be collected storehouses of written words, it's just that the large edifice known today as a library will become outdated. Once upon a time, in order to impress depositors, banks had to build enormous buildings with extremely high ceilings, to give an impression that they will be rock solid forever. Today, many people don't even walk into a bank once they've set up an account, they really don't need to be impressed by architecture.
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