There are plenty of public dissenters on the Girls Development Academy, just read these forums. But there are also many more supporters of the GDA, such as Christian Lavers, the president of the ECNL. His club, Eclipse, just joined the Girls Development Academy. I'd say that is pretty big endorsement.
And Rev, to answer your question, it depends on which side of the fence you're standing. You will not convince a non-DA club supporter of the necessity of DA until they are admitted. Just as you will not convince a DA club supporter that women's soccer was fine "as is".