Pallobi,
I've read the entire thread and have a few serious comments.
First, I agree that blue tangs should not be kept in small enclosures. We agree. I also agree that a serious discussion on this topic is valid, necessary, and should expand to include all possible specimens collected. Most would agree that the market probably will not regulate itself in regard to what is harvested from the sea and made available to aquarists worldwide. If we want it, and will pay the money to get it, someone will find the way to provide.
This leaves two possible long-term outcomes, as I see it. Governments will eventually step in under pressure from environmental concerns and begin to eliminate/severely regulate further collection of speciments from the wild, or we as a community can create a culture among hobbiests that frowns upon practices that lead to the routine and unecessary demise of the animals we keep - it just shouldn't be acceptable to kill through ignorance.
The question, as I see it, is who can lead such an effort in credible fashion, and how should the effort be disseminated? A forum like Reef Central is a good place to start. There are thousands of avid participnats here who could begin to establish the culture you appear to seek. As to who should lead, that is far harder to determine, IMO.
The goal of this thread is commendable, but its implementation is severely flawed. Credible leadership on such discussion is the key.