Cash money is so unfashionable today, the Banks hate the stuff so much they are calling to ban the promise the pay the bearer.
Last week the largest ISP in the UK (British Telecom) stopped working for 2 Hrs. Many businesses are still dealing with the consequences 5 days later. You would be surprised how many SME's rely on Credit Card/Payment cards connected to very basic home grade router some even using wireless with the most basic (i.e basically none) security encryption.
You will be surprised how many businesses would have factory reset those routers during that 2 hour down time.
The day when an EMP or a simple fat pipe network attack and no money will lead to utter chaos. How long now?