Go for it! Hopefully with enough complaints something will happen. Unfortunately, many of us are outside the USA so the organisation you mention will not be of much help to us. I can only hope that if you get results in the US then the same may eventually apply to other countries and that it will not be too late to submit claims for harnesses replaced here in Australia over the last couple of years (including my father's '93 E320 coupe at 120,000km). We are getting many faulty ones showing up now mainly in late six cylinder (M104 with HFM) W124s and early W140s (M104 and M119). Off the top of my head, I can't recall any four cylinder W124s (M111) or any W202s (M111 or M104) that have suffered the problem here (that's not to say there haven't been any). Note that since we are right hand drive, we did not get V8 (M119) W124s. The problem did not seem to surface here as early as it did in the US, probably because the majority of our MBs don't seem to cover the distance yours do (most here average 8,000 to 20,000km (5,000 to 12,000 miles) per year). Obviously with a much smaller population we don't have near as many MBs on the road to start with. I will follow this with interest.

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107.023: 350SLC, 3-speed auto, icon gold, parchment MBtex (sold 2012 after 29 years ownership).
107.026: 500SLC, 4-speed auto, thistle green, green velour.
124.090: 300TE, 4-speed auto, arctic white, cream-beige MBtex.
201.028: 190E 2.3 Sportline, 5-speed manual, arctic white, blue leather.
201.028: 190E 2.3, 4-speed auto, blue-black, grey MBtex.
201.034: 190E 2.3-16, 5-speed manual, blue-black, black leather.