Canada did it long time ago. Nobody cared and life goes on.
What happened was all payments using cash are rounding up or down to the nearest nickel. So $6.72 is rounded down to $6.70, and $6,73 is rounded up to $6.75. But if you pay digitally, the exact amount is billed (ie. $6.72).
Great change. No more pennies bogging down your pocket if someone if someone likes paying cash.