That would pop a lot of balloons.
No one has considered it becaue it is a ludicrous idea.
The tower of Babel comes to my mind. We have placed our faith in universal trade, Now it may crumble and we may be scattered again. Our own people do not have fundamental manufactoring skills, infrastructure, or factories. We may have oursmarted ourselves with Just in Time Delivery.
I hope I am wrong, but the possibility is there....