I came across this topic and immediately thought to my self of the advice often given here. "If you come home to a suspected break-in, call the police and wait outside until, they arrive to clear the home". It appears now that unless you know(or worse find out by entering) the thief is still inside they may not respond by sending officers.
No matter how the carry laws wind up being implemented in IL, this seems like a step in the wrong direction. To force citizens, armed or unarmed, to confront potentially dangerous situations. In an effort to curb one variety of crime, it seems they're opening the door to other crime where offenders know that police response is unlikely or will be delayed even further due to the back and forth.