There are several problems with burger flipping jobs as the primary sustenance of our economy. Unless there is a very broad middle class to purchase meals out (even burgers) there simply will not be enough of those jobs. In short an economy needs a market able to purchase its goods and services. Unless an economy is producing enough goods and services in a world trade envirornment to eventually balance out the imports then the value of the currency used to purchase the imports will fall until the costs associated with those imports is so high that no one can afford them.
Of course long before we hit the total collapse of the dollar and unemployment at 50% of the work force we will find the USA has degenerated into a state of civil warfare. The people of the USA will only put up with the outsourcing of their jobs subsidized with their tax dfollars for so long before there is blood shed and a lot of blood shed.
Why is a burger-flipping job more damaging than some other type of job? If I understand you correctly, the main issue is how much burger-flippers get paid. However, this is only important in relationship to prices of goods and services. If goods are cheap (near zero price) - I don't see how a burger-flipping job is somehow less honorable work than assembly line work if the purchasing power is the same.