I understand your reasoning. Personally I am not concerned about these few chemicals here and there in flavorings that may cause a health problem over time. For one thing, I smoked a pack a day for 18 years before this, so a little diacetyl doesn't concern me much. Secondly, if it is a big enough issue to cause health problems in a number of people, then the industry will be forced to self-correct over time just to stay alive.
You're right. That (the bold) is what has happened with the help of people in this forum, with other similar problems or perceived problems. And like I've said before, what happens here, affects more of the market than 'our' vendors by helping set a standard. And I'm sure the study will affect some vendors in a positive way - others will ignore it - at their own risk, I might add - and others won't have a clue, but if enough customers demand it and the proof of it, it 'self-corrects' without having a regulatory agency hitting every vendor and costing every customer. It may cost more - most premium eliquids already do if one wants quality. All diacetyl-free blurbs should be questioned, and all no mentions of it should be asked - by those so concerned - whether it's just the vendor or whether, as smokinrabbit suggests, they are just relaying information from their wholesaler or manufacturer.