"Do you actually believe that anyone at that number will do ANYTHING AT ALL?"
Sure they will, but consider the agency that's interested in enforcement. The IRS agents won't sleep nights knowing all those employers of illegals are evading taxes.
That is the key --- the IRS. The state of Georgia was working on legislation to deny deductions for a businessman who paid illegal alien wages. By not being able to write off the expense, it would discourage the hiring. I don't know where that stands.