This is my thought as well. Take away the supply of cheap labor coming from around the world, and from Central and South America, and you're left with lazy Americans. I don't mean that all Americans are lazy, but I mean most of us have led relatively toil free lives, and the idea of picking crops, cleaning, washing dishes, landscaping, or other hard physical jobs: Americans aren't that interested. Combine that with a movement of anti-work where menial jobs are heavily disfavored, add in a dozen other factors, and here we are.