None of that will happen, I assure you.
What will work? Death penalties for businesses that their owners and managers knowingly permit the hiring of illegals.
(1) Confiscate the business and its properties and assets; sell them off to their competitors.
(2) Minimum penitentiary sentences of no less than five years.
(3) Confiscation of all dividends during the period of criminality with a fine of twice the value of the dividends.
Punish business? Illegals will either leave on their own, or the older ones will live quietly with their citizen relatives.