It's funny that everyone says pretty controversial things. Some are sure that in the event of a global global military conflict, cryptocurrencies will be a priority, while others say the opposite.
Personally, I believe that if all of us turn off electricity, then we will return to the Stone Age, where we will not have time for cryptocurrency.
We already made solar panels to create electricity from the home itself so it won't be much harder to generate electricity which is needed to run electronic devices like smartphones or notebook so there is no more old age.