If a product demand goes down to a point where consumers are unwilling to pay enough to cover the prevailing wage and other costs of production then that product is unnecessary and should go out of production. The capital realized in liquidation should be used to start another more fruitful enterprise.
Assuming the product is needed or desired at all, its demand is flexible based on price. There is more demand for burgers at $0.50/burger than for burgers at $5.00/burger. So there are more jobs at the low end and less jobs at the high end and it has nothing to do with people not demanding burgers. At some point, say $20/burger no one buys burgers.
Demand decreases as price increases. So now you only want goods and service to be offered if they support a prevailing wage. So if the prevailing wage (however it is defined) is say $15/hr. Then burger flipping jobs should be eliminated if they don’t support $15 since there is a limit to how much people will pay for a burger.
Maybe Pelosi burgers can support paying prevailing wages but most burgers do not.