Originally Posted by
Vampire Savior
I think it's basically to do with not having any influential black people behind the scenes. Green Lantern was written and run by a bunch of white guys who seemed like they couldn't give two f's, and I don't think any of them particularly connected with John Stewart. They can say they're behind diversity, and they can even think that, but their own perspectives and interests came first, and much of the time they ran counter to actually promoting John Stewart.
Now, consider when Green Lantern was written by a black man (Christopher Priest). This is a really weird example, but despite him writing John Stewart surprisingly poorly in Action Comics Weekly and the Green Lantern Special, he actually paid attention to the character when anyone else besides maybe Steve Englehart would have forgot or ignored him. He gave John Stewart a power ring again and made stories specifically about him. And to be fair, he didn't do Hal Jordan any favors, either. I think the strange writing (Kat dying, the Apartheid story) was more to do with the times than any malice or incompetence on Priest's part. Watchmen and Dark Knight Returns had recently come out and were huge hits, and the direct market was becoming more and more the go to market for comics. As a result, grittier, "darker" storytelling that pushed the envelope was becoming vogue. Unfortunately (again) John Stewart just happened to be the recipient of it over and over again.
I should correct something I said above some. I don't necessarily think you positively need a black person behind the scenes for black characters to be done justice in a sea of old time white heroes. But I think you often need someone who actually cares about this stuff, and a black person, on average, is more likely to care than a Geoff Johns or someone like that. Otherwise, as DC has shown us with such shining examples as John Stewart and Cyborg, it's way too easy for these characters to be mishandled, forgotten, buried, and abused. Someone to step in and say, "Hey... we shouldn't do that to the character. He's one of our only prominent black heroes and he'll never recover from this. We have black readers and... you know... we should want to keep the ones we have and get more." "Hey, what do you think about shining some spotlight on this character? I'd like to do stories about him." I don't agree with everything Bendis does, but he really seems to be someone like that. Neal Adams is, too.
Then again... there was what Bendis did to Rhodey so he could make way for his own creation... so... I dunno'. But I think the point stands.