Well...They still have the option to go to negative rates. If they do, expect the demonization of cash to get ramped up 10 fold.
Negative interest rates are another Fed intervention, and once again, all that it does is create more money and credit.
The fed can't dictate what banks pay to savers; they are limited to setting the interest rates for deposits at the fed, and they buy and sell treasury bills to drive the market rates up and down.
In Europe, where several central banks are using negative rates, the banks have NOT imposed negative rates on savers. That would certainly drive customers away. So bank profits are squeezed a bit, and banks are even more vulnerable than they were before negative rates.
Negative interest rates for banks are a tool to create money and credit. The negative rate is supposed to provide an incentive for banks to lend instead of holding reserves, since they have to pay to hold those reserves at the fed.
But when a bank lends money, it creates it from thin air. Typically they lend out 9 or 10 times as much as they have on deposit. That's why I say that negative rates, like every other evil act of the evil fed, is just another mechanism for creating money.
Peace,
Silver