So, they're going to have carriers still going out to potentially drive most of their route with a total postage amount in the vehicle substantially reduced.
Yes, but fewer stops, which mean over fewer hours. And since there's less overall mail, there's a potential for fewer trucks.
Don't forget the overall volume doesn't decrease (as a result of this decision), just the number of days. I would assume the volume would go up on Monday as a result of this.