You're free to use credit, just as other people are free to use cash.
Just as businesses are free to accept all forms of payment they wish...it's not like THE SHADOW GOVERNMENT took your cash, right? What if they start refusing cash but accepting BTC/ETH instead? Or they are willing to barter with you, two goats for a tank of fuel?
If you get ride of cash, you are forcing everyone to use credit, even if they don't want to.
While I think the death of cash is inevitable, no one is forcing anyone to not accept cash at this time. And you know the difference between "credit" and "debit" right?
Just wait until the power is down and you can't use your credit card for something you need. You'll wish you had a few bills in your wallet.
This is a better advertisement for a more resilient power grid than cash over credit/debit. If you have to wait for a SHTF situation to prove you are right, you're going to be waiting a long time.