The article says: "... seeking to knock out the "first sale" doctrine on goods made abroad" (emphasis mine) - surely a product made abroad, but sold in the US by an authorized importer/reseller will still be subject to first sale? And it would still be legal for students to buy books for themselves abroad? Even the example mentioned where US students buy books directly on Amazon UK doesn't seem to be affected - just their right to resell that book in the US?
It's still a big deal, but it seems that Ars is making it quite a bit bigger than it is.