If the airlines have a problem with the amount of baggage that passengers bring on board, they should do something about it. Set limits that the aircraft can handle, and enforce them; not to mention sorting out the checked baggage security and safety. I know the airline doesn't handle the baggage, but the passenger's contract is with the airline; it's the airline's responsibility to handle their subcontractors.
I hate the amount of baggage that some people take on board; but the problem I have is with the airline's failure to actually police it more than the people who take it onboard. If they bothered enforcing the rules, the message would soon get out, and people would stop bringing it all.