Unskilled, humiliating jobs for very low pay with no hope of a promotion or career always existed. If this industry doesn't create more jobs like that, it means

Unskilled, humiliating jobs for very low pay with no hope of a promotion or career always existed. If this industry doesn't create more jobs like that, it means it's only getting the ones that were already here, and doesn't change anything. If this industry creates more jobs like that, shouldn't it mean that competition for the lower-skilled workers will increase and their pay will go up?