I haven't outlined any scenarios, but maybe you're considering a total Internet shutdown. No such drama is needed to make the case.

Deloitte calculate the per day impact of a temporary shutdown would be on average $23.6 million per 10 million population. Not that bad actually. But that figure seems based on the immediate hourly estimate from places like The Uptime Institute and LSE. Other estimates puts it at between $11Bn per day for the whole USA [0] and only $10Bn for the whole year [1]. In reality the impact quickly compounds, making day 2 (24-48 hours) significant worse, and so on [2]. I am quite sure the aggregate downtime of AWS, Azure, Google and other cloud services in the past year has exceeded 24 hours per capita civilian use.

Being able to take cash, as a "flywheel", makes or breaks businesses in those times.

[0] https://bnn.network/finance-nav/unraveling-the-impact-of-glo...

[1] https://arstechnica.com/tech-policy/2022/07/internet-shutdow...

[2] According to studies I got masters students at York Business School to undertake.

edit: formatting