Why would it be reasonable? If you're not willing to perform a job at the current pay grade, just quit your job. Either you get replaced immediately or you've got yourself a chip in your salary negotiation.
The switching cost is near infinite and not reflected in the pay.
That is not an option for those living paycheck to paycheck, or not in the prime of their life.
Human beings are not a resource, and managers need to understand that there is a social cost they pay and thus need to comply with a social contract.