[tutufan]

That's correct. As a society, we ought to either accept this, and the resultant (probably large) increase in wine prices, or create a legal program for transient low-wage workers.

But by trying to have our cake and eat it too, we're placing illegal workers in a rather unpleasant situation (or motivating them to place themselves in such situations, if you prefer). They're ripe for all kinds of abuse, and lack the kinds of stability we all want.