Problem there is that is an insanely unrealistic idea. Do you realize what something like that would cost? Nobody would ever improve anything if every product improvement had to be retroactive. Not to mention that in the case of the 550 Mark II's the changes are extensive to the point that they can't simply be bolted on to the older saws. And who gets a credit on a new saw? The few guys who had problems, or the majority of owners who didn't?
I know that on sites like this, EVERYTHING gets magnified way beyond it's scope out there in the real world. I've lived through the intro of these saws and all of the improvements over the last 8 years selling hundreds of these things. Really wasn't all that bad and whatever chatter is out there certainly hasn't slowed down the sales of these saws one bit. Guys really love 562's. Only thing that was a legitimate pain was the hot start issue, but that has pretty much been eliminated except on the hottest days. Get up around 90 degrees and it'll still happen. But then how many saws like to restart in that weather anyway.