I can confirm that Aliexpress doesn't allow me to checkout with a USA address and states that items can't be shipped to my region. -edit: Since this post it seems that I can order items again? Very odd.
Cainiao (AliExpress's shipment arm) and others will probably end up chartering planes to get customs' cleared packages to the US and then cross-ship them from somewhere in the US like Kentucky or Long Beach. Shipping costs will rise but hopefully not by much.
>The majority of inbound shipments originating in China come by ocean or air freight, not the mail system.