While you might be right, I'm not entirely sure about that. They admitted to the THX issue, and fixed it (although it took some time). I have to think it's a matter of cost - that downplaying the issue is somehow more cost effective than a fix/repair. Perhaps class action threats will change that perspective?
Edit: In addition, I'm sure Pansonic considers the 2009 models dead and not worth pursuing. My guess is that all their developers and engineers are working on the 2011 models. Not cost effective to fool with the 09s.