Temporary suspension of acceptance of mail to the United States

I'm worried that this could have unforeseen knock on effects or create havoc. Fukushima knocked out global supply chains for parts on cars so for a couple years there were no Honda fits for example (they were missing a necessary but small part). Is there any risk of domino effects having to do with business closures or is it just moronic and annoying?

This is specific to mail service, it does not impact private carriers (fedex, dhl, etc)

The toilet paper shortage during covid lockdowns came from people switching from the stuff stocked in offices to the stuff they buy for home. People switching to alternate carriers could have a similar impact.