This basically matches my own analysis, which also includes: when people of privilege play the "They're playing the Oppressed Card!" card, it's always the people of privilege who win. So it'd be really foolish for someone to falsely play the Oppressed Card in an attempt to win; the only sensible reason for someone to 'play' it is if they actually, y'know, value the truth and the cause over their own personal success. Even if I ever had reason to think Rachel and/or Sherwood were dishonest, I definitely wouldn't have reason to think they're so foolishly naive.
But more importantly, Joanna from the agency eventually gets around to admitting:
There are not enough mainstream books that depict characters of diverse race, sexual orientation, religious beliefs, and physical and/or mental disabilities.
Changing this starts with the readers. Scott Tracy has a great post about this on his blog. If more people buy books with these elements, then publishers will want to publish more of them. Sounds simple... yet, it’s not so simple.
How do we reach the readers who are looking for these types of books? And more importantly, how do we reach the readers who aren't specifically looking for them?
And this - specifically "Changing this starts with the readers" - is bullpucky and hogwash and is exactly what the problem is. Agents passing the buck to editors passing the buck to bookstores passing the buck to readers. "They won't buy it so I can't." I say again, bull.
Yes, readers should read what we can, but not everyone likes every book, and it's unfair to demand readers read a book they don't otherwise like just because it's got gay content. If readers are to read more, we need more books to choose from. How are readers supposed to buy it if the bookstore doesn't stock it, if the publisher doesn't publish it, if the editor doesn't accept it, if the agent doesn't represent it, if the writer doesn't write it?
Rachel and Sherwood wrote it; plenty of other authors have been writing it. The next step for an agent who wants things to change is to represent it. If you want to "reach the readers" then take that step. Because you're not going to get anywhere by standing still.