You're right, but also they now have to let people carry an airport shopping bag on as well. The airports seem to take great pleasure telling people they are ENTITLED to take an extra bag of shopping, which of course, some read as being ENTITLED to take as much shopping as they like on top of the trolley bag, handbag and maybe laptop bag and camera they decided to bring as well.
Charging for hold baggage was the wrong direction, the problem lies on board. Wizzair have the right idea, although I have not flown with them for a long time, I remember there being hardly any piss takers on board my flights with them because they would be charged for their sins!