That has been a regional issue for 15 years. There's the possibility that they aren't representing the view of the majority, which may skew projects one way that the general public would not be supportive of. At the same time however, I would think they'd jump at the chance to be represented at these types of events to disseminate their information, and network with other groups which may share similar goals.
Some groups just use any opportunity as a soap box, as did our friend from the Long Beach area.
I happened to find out that the meeting was scheduled for the same time as the Sierra Clubs Executive meeting, and many members wanted to be there, probably the same people who are the heads of other interest groups concerning the future of the wash, and urban greening. With the wash, and the changing view of the river, this may be largely driven by the public's perceived desire to see change. I do think it was a good move to get the article in the Times, so many people can see it. And large graphics, like maps, get people's attention so they may read the article that accompanies it.