What a depressing thread... cynicism rains supreme, but it is not all the fault of some, but a corruption of the majority.
I don't think people are all that negative really. Possibly just a bit fed up with the constant stream of "idea guys".
All that people in this thread are really saying is you need _more_ then "just a gdd" to get your game made.
And some excellent feedback on what is needed
It's just reality based on simple principles like supply and demand...
Not to mention the way these "idea guys" usually try to trivialize every other part of game making, and imply that those who don't hold the title "designer" are like mere construction workers building according to the blueprint.