That pretty much sums it all up, doesn't it?
Though I would add one more thing -- much of the underlying demand for cheap labor comes from American consumers!
The savings from the labor isn't being passed on to the consumers anyway. Houses in California certainly aren't cheaper than those houses built in other areas where Americans build them. I've seen lettuce sell for over $1 a head, milk sometimes is over $3/ gal. Someone might be getting very wealthy but food isn't cheaper now than it was in the 70's.