As I said on a neighbour thread, it's not about crypto Vs paper money. It is about crypto Vs centralised bank system and digital currency like Visa, Amex etc.
As long as we are human race we will always need Paper money or gold, or platinum or something else what we can hold with our hands without on-line services or spending an energy power for it's existance.
Imagine what happens if most part of greatest Internet data centers become off-line for some reasons. Where are your crypto or digital money ? How could you get them back?