I think it doesn't make a difference.
You honestly think that in an almost fully automated factory, the difference between skilled mexican laborers and skilled german laborers (if there even is any actual skill difference) is really going to be a big deal?
The German engineering is what makes the difference, not the manufacturing.
1) Rabbits were never made in PA - they were assembled in PA (poorly) but there is a big difference.
2) U.S. Golfs will NEVER be made anywhere but germany or (possibly) the U.S.. The GTI will never come from anywhere but Germany