In a Curt Lewis article a couple of days ago, it stated that Boeing were redesigning there overhead bins to fit more in!!!! I think this just a band aid over the problem. Education and enforcement of the rules needs to be given to the public.
For me, I don't want 42 kgs above my head, ready to dong me when things start going pear shaped. If you look at the stats on the number of bins that have failed after an incident and I am sure that everyone would want it all in the hold, where it belongs.
Get the airlines to take control or get CASA in with one of there restructured audit teams to audit flights after they land at Sydney at rush hour. Prosecute the airlines for permitting and the pax for failure to follow directions. Maybe then, crews won't be blamed for allowing this to happen.