Post office facilities would certainly become outdated if the USPS were to stop delivering to individual homes and businesses. They would need to expand their P.O. box areas and build larger parking lots, for one thing. But a lot of the problems associated with this kind of operation could be offset by simply leaving the P.O. box area of a post office building open for longer hours (maybe even 24/7) with no on-site staff available for customer service outside normal business hours.
So your recommendation is that I either (a) wait on a long-ass line just to get my mail, or (b) spend 70 bucks a year on a P.O. box just to get my mail?
It’d cost me less in taxes just to fund the damn post office.