Want to see this in action already? Go talk to anyone in the cannabis business in states where it's legal. They've been dealing with being "unbanked" for years now. Agree or disagree with their product, that is what happens when a business cannot use normal banks. Or ask Andrew Torba, who can't get a bank account in his own name because they disagree with his politics. He's doing absolutely nothing illegal or immoral, and he's been frozen out. But like Andrew, we need to establish means of doing business without the banks. For all my "side jobs", I always put the possibility of paying in silver or gold in the quote. My parents always had a "willing to barter" sign in their businesses, we made some pretty good trades.
I keep the absolute minimum in my accounts for day-to-day stuff. Just be careful with the reporting requirements that the banks have with cash transactions/deposits. And work with a small local bank or credit union if you can find one, they'll always be more accountable if they have to deal with customers for their own personal business.