The biggest problem I could see would be for those who pay their bills via USPS. An extra day for payments in-transit could translate to more late fees. Of course, this problem should take care of itself before too long -- once people realize that Saturday service has ended, and they need to mail their checks a day earlier. It's consumers' responsibility to understand how to get their bills in on-time, even if the mail service changes its policies. Besides, with each day that passes more and more Americans are choosing online or phone-based payment options, rather than rely on the mail.
A much smaller worry: I wonder, though, how Netflix or other such delivery services that utilize USPS would feel about this change. As a Netflix customer myself, I admit that I wouldn't be thrilled with having one less day per week to mail or receive movies. But given their new on-demand service that I can access through my Blu-ray player, I think I could supplement any lack of mailed movies through that option.
Bottom line: it seems that technology will increasingly take the place of postal service in the years to come. This time around, Saturday service may be eliminated. But give it a few more years, and we might see Monday-Wednesday-Friday service. One day, USPS may be eliminated entirely.
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