Carol, bin hogs being one of my personal pet peeves, are you saying the advocacy team you mentioned is suggesting the airlines enforce their own carryon rules as an option? I reserve my right to be angry when I see a fellow passenger, as I did on Tuesday, fill one whole bin with his carryon (sideways as it was too big to fit the right way), his "underseat" carryon bag, his computer bag, his jacket, and his duty-free bag. Yes FAs are too overworked to police this, but gate agents should. No, I didn't throw a childish tantrum, but I do resent it. I'll admit I did admire the way he skillfully cut in the boarding line to board fast enough to claim his space.
I recall a few years ago when one of the domestic airlines (Braniff?) mentioned that they were responding to carryon size complaints by - getting larger bins. Thus ensuring their customers would start bring even larger bags aboard. Not confident in the long term outlook here.