Yet if the cows stopped producing milk, the farmers would simply let them all die off. And to stretch the metaphor, while the cows produce milk they have the op

Yet if the cows stopped producing milk, the farmers would simply let them all die off. And to stretch the metaphor, while the cows produce milk they have the option of unionizing. Saying "we'll all quit if you don't treat us better" only works while they care if you quit.