I'm all for it. Since they did away with most of the closets there's hardly any room for my bags when I commute. Those pesky passengers want to take up all the overhead space.
Oh and this is nothing new. We used to have bag size checks at each gate and required passengers to check if it exceeded the frame. From a man power position most people carry their stuff to the gate these days and check it there. This causes a need to have manpower available to grab the bags, slide them down the jetway hand carry them to the pits or cargo pod.
Another issue I noticed are those passengers who are coming off an RJ. They expect their bags to be delivered to the gate on arrival rather than the terminal.
Oh well it never ends.