The trouble with the business amnesty crowd is they think legalizing folks will enable them to hire more legitimately. Perhaps. But for the many who use migrants and illegals, their business model is based on underpaying market wages. Once the illegals have been amnestied, their base salaries will be the prevailing US wage. If these businesses cannot pay that wage now, they will still require more slave laborers. Illegal immigration will not stop.
I think the goal is to have amnesty act as an attractant for more illegal aliens, who they can pay under the table and treat as de facto slaves. That’s the way the 1986 amnesty worked.