One more note. If we really want to get Apple to take this problem seriously then we need to complain to the underwriter of their protection plan!
The #1 reason Apple doesn't take this seriously is because it costs them nothing to repair our systems. If you don't have Applecare you pay for the repair. If you have Applecare an insurance company pays for the repair. At no time does Apple experience financial loss. In fact, they make a profit off each repair because they charge a fee to the insurance company for the repair!
However, the underwriter can choose to nullify Apple's insurance policy and charge them for all previous iMac repairs if they suspect it was a systemic problem or design defect. Imagine the insurance provider suddenly calling Tim Cook and saying "You know the 100,000 iMac's with LCD problems that we've repaired in the last few years at about 500 bucks a pop? Well, turns out it was your fault. We need you to pay us 5 million dollars please."
Tim Cook would get this problem permanently fixed in a week if he was facing a massive bill from his insurance underwriter.