They basically have. By charging for checked luggage, of all things, they’re creating a Survivor-like competition for who can get their bags that would normally be checked past the gate and into an overhead bin. So you’ve got people who are struggling to get a small computer bag in the overhead if they are among the last to get in, while there’s someone who put a giant roller-duffel and their “backpack” in overhead.
Last flight I took, an overhead bin opened during takeoff and dumped a bunch of hard shells on people. Gave the person in the aisle seat a bloody nose. They keep it up and someone’s going to get killed by stray luggage during turbulence.