Would they have to recall their boxes if wikipedia decided to destroy the contribution history and they couldn't find any way to reference it? Can their competitors now use the same designs for their boxes if they reference wikipedia? Seems a little farcical to talk about all this stuff as none of GNU's licenses have been tested in court yet right?
I specifically said that it wasn't anywhere near enough for actual compliance, and it was never intended to be. It was intended to be a suggestion for how to show good faith and do what normal people (ie. not lawyers) would consider fair. Satisfying the lawyers is far harder, and, as you say, until it's tested in court we're not even sure how to do that.