Just want to underscore this point. The ability to produce complex molds quickly and cheaply is a huge advantage for China. Metal 3D printing however may indeed be a potential game changer here.
Materials cost? Salaries? Cheap CNC machines? Several mechanical engineers on call with long shifts?
The whole world is currently offshoring this work to Chinese firms who already have the experience.
Not to pick on you in particular, I see this sentiment a lot. China is no longer cheap labor, their dominance in manufacturing is due to expertise.