One huge problem with not charging the deplaning passenger(s). Luggage belonging to individual passengers, must accompany said passengers. A deplaning passenger's luggage would have to be located and removed, which would delay the plane and create a huge inconvenience for all others.
I call BS. There are many times when I catch a flight with a connector, and my luggage goes nonstop, or vice versa. What you speak of was the "old" method where we thought that muzzies would not blow themselves up. Bags are now screened in a different fashion, because the old method jammed up flight schedules. Suffice that if you are going somewhere for more than a day or two domestic or international, UPS, Airborne, and FedEX are GREAT ways to send your stuff in advance. Some of us do this every week. Guess what? A freight tracking number works much better than dealing with the gorilla in baggage claim. And you get out of the airport an hour earlier. It is not a crime to fly without luggage. Yet.
If I had missed my Chicago to LA flight, due to my mental lapse, does that mean the flight shuts down, until they get my luggage out of the cargo hold(which was where it was since it was transfered from the London to Chicago flight), if I had chosen instead to more fully savor at my leisure the joys of the intricacies of O'Hare airport?