Well, there are a lot more .gay people in the world than .ninja. I just don't see even a quarter of these ever being in common use.
I do see your point, but I would have to agree with
@Eric_Lyon on the personal blogs and whatnot.
It's somewhat off topic, but I like to do my social responsibility. I was going to invest in a .hiv for the same purpose, as a way of donating and showing my personal support. However, HIV is a virus that can't be combated unless millions more registered that gTLD, or donated. So it's somewhat saying, I didn't vote, because I knew the candidate I wanted wouldn't win anyway. I know, pretty hypocritical. (Though, I do donate to this cause)
Now on to the .gay gTLD, it does have a lot of people that may take it in and use it as a personal blog. The term we loosely use as being derogatory towards the LGBT community (faggot) is used among themselves in a positive manner, though dropping the
got isn't.
There are plenty of people who are proud to be gay and this may be the gTLD that shows ultimate support towards the movement of total equality, if everyone that is gay and runs a blog, does switch over.
The number of developed websites may drastically beat other gTLD's in the race, it's all how they will market it.
Even though there are a lot of gay people, the community is small so to speak. With that being said, it only takes a couple influential people to make .gay the gTLD of choice for bloggers, etc.
I could even see Ellen.gay and her promoting that, quite possibly over EllenTV, and winning a lot of registrations for the registry.
As you can see, it only takes the right person to send the message to the right target audience, and you have yourself a winner.