If they quit, tough luck. If they force the company to fire them, then now let them fight wrongful termination.
Suppose the employer says vexinate by November 1st or be fired. Suppose the employee finds a new job at 50% of current pay and quits the current job.
Was the employee damaged by the employer’s policy? Can the employee sue the employer?
Are there lawyers who might be willing to litigate? Would employers want to settle such a case?