they will not because the reason japan (and the US) lost theirs is that china was cheap.
Where are you going to get this type of labour - skilled but cheap - other than china, in the next 10-30 years? Southeastern asian countries could make up some of the amount, but if they could do it today, they would've dominated already!
The repatriation of manufacturing is political propaganda - it won't work economically, as consumers' preferences is overwhelmingly for cheap goods, not expensive patriotism.
