Except Clara, if you look at the links I provided, women DON'T dominate YA in terms of visibility, in terms of bestseller lists, in terms of awards, in terms of the stuff that puts them in the public's (outside of the book world's) mind. So I'm not sure how they're dominating except for that you aren't reading widely enough in YA, because there are a TON of male authors out there and they get a ton of attention. I paneled with two incredibly lovely ones, Matt de La Pena and Marcus Sedgewick (who just very deservedly won the Printz) just last week and I HIGHLY recommend both their books. And I have had friends who have to "genderwash" their names in YA, because they just happen to be writing about boys.
First of all, this isn't persecution at all. No one is saying John doesn't deserve his success (he does), or that he should give it up or calling to not buy his books (on the contrary, I think everyone should read my favorite of his, LOOKING FOR ALASKA). The articles about how John is treated by society/the press is a critique on our society and how the press prefers to build up white males over all else and the disturbing trend of painting Green as a prophet or a savior when if a woman had written THE FAULT IN OUR STARS, it would have been dismissed as yet another romance written by a woman. This is a very disturbing, very prevalent trend. And because we write for teenagers and because John has so many female teenaged fans, it's important to make them aware of the faults of society and the press. If young women only see men writing "serious life changing fiction" and only male writers held up as "saviors" then they're going to think women have to only write "fluffy" fiction that gets no respect and that women can't be saviors. And that may rob us of some REALLY important voices in the future.
Men have something called "male privilege" that women do not. This is not John's fault, of course. He's a man, he can't change that. But he's obviously aware of his privilege, because he insists women be on any panel that he's on (which again, I think is super cool of him). This is society's fault and how we see men and women (not just writers!). This is why women are still trying to fight for equal pay. Why male politicians get away with comparing us to things like farm animals and try to take our rights away.
John is not hurting anyone. But the way the media portrays him as a white male savior to a category that does NOT need to be saved IS hurtful and disrespectful to the people who helped build up the category and the women who struggle to make a living off their books every day. That's where everyone who is talking about this is coming from. We have a huge diversity problem in children's fiction. To have so many people focus on a white man (who writes pretty exclusively about straight white privileged children--WILL GRAYSON WILL GRAYSON being the exception here, though I think David Leviathan wrote the LGBT character's POV in that) saving us is very disturbing when we need so much more diversity. And when we don't need saving. Stephenie Meyer is not holding us hostage. Neither is Susanne Collins or Meg Cabot or JK Rowling. All women who were blockbusters and power-sellers before John Green's success. Yet there aren't articles about them saving YA even though they've given us more books, film franchises and global popularity. Instead, they are continually put down in articles about him in order to separate him from the "silly" YA because he writes "serious" YA. The Hollywood Reporter just put down none other than the goddess JUDY BLUME in order to build Green up, implying that he had passed her, success-wise, because he'd gotten a movie made, conveniently forgetting that a) Judy's written a hell of a lot more books in a broader range of age categories than Green and has lasted DECADES and DECADES and b) she wouldn't SELL her books to hollywood. TIGER EYES, which was released a few years ago, was directed by her son I believe, which is the only reason it got made.