Here's essentially what is happening today, in practice (not theory):
Let's say I put up a huge wall between you and me, and I tell you, a manufacturer, that in order to do business with folks on my side of the wall, you have to pack up your business and set up shop on my side. You don't have anything to lose, since the people on your side of the wall would never prohibit goods from coming over to their side (they're all free-traders, except for that one Anti-Federalist guy who doesn't like what he sees going on around him, lol). So you jump over to my side, and now you can do business on both sides of the wall.
This is why China is booming. They have a wall up that only lets goods go one way. No one is going to pass up a billion-person market, especially when they can tap the Chinese and U.S. market (300 million) just by relocating to China. If anything, Chinese tariffs on imports are actually attracting businesses to China. The consumer benefits as well, because more businesses means more competition. More competition leads to lower prices.
Plus they have jobs too!