Researchers also said immigrants would be needed to replace the baby boomers who are retiring.
State senators say it's necessary to know the facts before they can move forward.
"To move away from the hysteria and the rancor, and to move to more fact-based and data-based discussion -- one that's based on sound public policy," said State Senator Gil Cedillo.
In another development, lawmakers are proposing a bill that would allow illegal immigrants to pay in-state tuition if they've attended at least three years of high school.
Opponents argue it gives an undocumented resident an advantage over an out-of-state U.S. citizen.