They won't be locked out, they'll just now have to pay whatever the standard rates for USPS shipping (or whichever carrier they'll use), instead of the artifici

They won't be locked out, they'll just now have to pay whatever the standard rates for USPS shipping (or whichever carrier they'll use), instead of the artificially low rates mandated by the UPU. Presumably someone (whether in China or in the US) will find it worth selling whatever widget you want, just the shipping cost won't be subsidized.