I suspect that for situations where you want millions of the exact same thing, 3D printing will never replace high volume standardized manufacturing.
However, you could imagine a world where additive manufacturing does become much cheaper and faster to the point where many more things are made with subtle customizations, or made on premise, etc. New paradigms almost never replace the old thing directly, but take over by changing the way things are done and measured.
I suspect that for situations where you want millions of the exact same thing, 3D printing will never replace high volume standardized manufacturing.
However, you could imagine a world where additive manufacturing does become much cheaper and faster to the point where many more things are made with subtle customizations, or made on premise, etc. New paradigms almost never replace the old thing directly, but take over by changing the way things are done and measured.