well, it wouldn't last long. eventfully those low tech manufactures will move to other places and other countries such as vietnam. the real problem will be jobless for those who are under educated, with no skills and their numbers will be in multi, multimillions...
They can just go back to the country side, breath the fresher air and drink clean water and and plow the field and plant the crops and get married.
Life will go on. At least they can enjoy the time and leisure.
Better than being a helpless and hopeless slave in one of these sweat shops.
Don't you worry about them.
Look at the Indians in India. They take their time to enjoy their lives. They never wanted to become some kind of stupipower or superpower, whatever.
You give him a dollar, he will give a dollar-worth work.
Too little profit margin ? too bad. Go somewhere.