Lakestone Bank and Trust Just Made A Problem, Oopsie

[Georgi Guninski]

On Wed, Dec 20, 2017 at 10:02:30PM -0500, grarpamp wrote:
> https://www.reddit.com/r/Bitcoin/comments/7l461c/banks_trying_to_come_down_on_crypto_investers/

This greedy bank well might kill herself, possibly downing large
amount of the rest of Ponzi scheme banks.
It is enough critical (possibly not large) part of their lusers 
to ask their money back.

This leads to the question:

How would a cryptocurrency work if the banking system is down or there
is global hyperinflation?

AFAIK the bitcoin core blockchain is about 150G and it can't track
every beer bought for pico BTC.