People are willing to commit to unfulfilling, exhausting minimum wage jobs because the alternative is to not have a home/decent food/a little spending money. If those needs are already fulfilled, its going to take more to convince people to do something economically necessary but unfulfilling/difficult.

So, the supply drops (many people choose to simply sit out the whole job thing if its going to be unfulfilling). At least, this is the theory.

Or, to paraphrase, fast-food and big box stores might not be viable business models in such a world?