Assuming Illinois pushed this though (and I don't think it is very likely), the eventual result would be the State of Illinois writing a very large check to plaintiff's lawyer. We've made stupid moves like this costly before, and can continue to do so. Politicians don't care when it's not their money, so obviously winning both the right and the payment doesn't hurt them.
What will hurt them? Being out of a job and so tainted that no private employer would touch them. It's a start, at least.