I remember as a kid how much money my parents would have to carry while on holiday, banks were closed and ATMs rare and often empty, shops in the country often wouldn't take cheques. Credit cards resulted in really slow vendor payment (remember paper credit card chunk clunk? those numbers are raised for a reason) and caused cash flow issues.
Anyway, one of the major telcos had an outage of their EFT system the last holiday weekend and everything broke. Except for people who had cash. I was quietly smug, but it shows how fragile the payment systems are.
I'm looking forward to a decent Weibo hack to cause a reassessment of the single centralised 'trust our ledger' model.