This will take probably a few years to sort itself through, if it remains the delivery model we're left with. Both the maintenance costs and the adjustments for snow plowing in particular will have to sort themselves out in a regular winter, which last winter wasn't. The capital costs of the replacement of those locations will also be a concern.
We also have no idea, because we weren't consulted, whether some of these mailbox locations might be over top of a service line that goes from the city sewer water main directly to a residence and whether some of those might require extra costs as a result of replacement in the normal course of events.
I think we need some years of experience to really have a clear picture of what both the maintenance and the capital costs might be.