The unemployment rate is what, 3%? Where are you going to find the millions of people needed to make the iPhone domestically? Immigration? Hah, that would be an interesting stance. Automation? It would work to fill some gaps, but even apple doesn't want to pay Chinese workers for tasks that machines can do today. Someone in their company decides on when they automate, and when they use elbow grease. They may be able to afford a lot of the capital outlay to greatly improve the productivity of their workers if effectively required to onshore, or they may just stop selling iPhones in the US for a few years if all cell phones become prohibitively expensive to own. If Apple can't make the economics work, I can't see who can.