Don't underestimate perception. Fees/taxes/"negative savings interest" are much more visible than inflation. I'd be surprised if that didn't cause bank runs.
For my part, I already carefully manage how much I keep liquid versus invested, but anything equivalent to a fee would cause me to switch institutions or otherwise drastically change this strategy.
For my part, I already carefully manage how much I keep liquid versus invested, but anything equivalent to a fee would cause me to switch institutions or otherwise drastically change this strategy.