You'd think Science Fiction as a genre would be the most open to other voices precisely because of its "ghetoized condition", even from outside of regular canon it still has to break certain barriers, traditions, beliefs... I guess every little piece of literature has its own mechanisms by which it inserts inself inside or outside of canon.

Well, it has taken a fair amount of ass-kicking and name-taking, but I feel like we are making progress. The majority of awards in the field are going to traditionally-marginalized authors now. They're still lagging in sales, because the most popular authors are still the ones who market primarily to tech-obsessed young men, but the core community has become much more inclusive.