http://www.bangkokpost.com/learning/...t-gets-results
Some highlights:
Thai Rath online reports that Mr Tarin Kaenkhunthod, the head of the taxi drivers association, has strongly denied his group is involved with the controversial sign, calling it very inappropriate. He also threatened to take legal action against the person posting the photo of the sign in the social media.
"Passengers pay tens of thousands of baht for an air ticket. Why can't they pay a few hundred baht for a negotiated fare," he asked.
Also, although it's not in the article and I can't find an English source, there is a clamor for a per bag charge now.