So… I got asked this question over on GoodReads and ended up “answering” it by talking about where I think the market for GSRM fiction is currently going.
Tl;dr, I think things are trending upward, but publishing is still a business before it’s an altruistic machine of social change, so… yeah. Basically, the better books with diverse protagonists do (i.e. the more they sell), the more will get published and the more prominently they’ll be marketed.
Welcome to capitalism, I guess.