What others states have measures like this? If ISC finds it unconstitutional, then cases in other states can use it as a defense. That would open it to interpretation in a different ciecuitt, which would either have another circuit (9th Circuit, here's looking at you) or send it to SCOTUS which then would become law of the land.
IIRC New York and New Jersey both have a similar license for mere ownership of a handgun that is seperate from a license to carry. Maryland too perhaps?
I can say this about Illinois: My girlfriend lives about 40 minutes south of Effingham. I spend a lot of weekends out there. A vast majority of the people that live in Il hate the fact that their state is dragged around by it's nose by Chicago politics and resent the fact that they get constantly outvoted by the idiots in Cook county. I've met lots of people out there and they don't seem any different than your average Hoosier or Buckeye. They would all be in favor of throwing Chicago and it's BS out of the state.