Or they will move closer to supply. It becomes a question of what is cheaper. Transporting raw/component materials near population centers, and then deal with all your waste near population centers, or building everything close to supply, far away from population centers, and polluting where "no one really cares".

I am cynical, so I'm going to guess the second. Even if we get mass robot manufacturing, we'll just let China continue to build all sorts of stuff, cause it's easier to pollute there.