I think @SchuylerThorpe is also highlighting another issue that I think perperuates this problem and falls in line with it.
As much as we’d like to blame the industry, society and culture for the lsck of diversity, us as readers are equally to blame. We honestly can’t control what people write and publish, and we shouldn’t. They’re free and entitled to write whatever they want. HOWEVER, the author is NOT entitled to be read or bought. Which brings me to readers:
You need to make critiques with your comments, and make demands with your dollar.
Us as readers who are troubled by this lack of diversity, by the white default, we tend to mix those two up. We end up demanding with our comments, but buying all the things we hate. We need to talk and share more, otherwise i think we are in some ways just playing at a fad. We make diversity “the flavour of the month” and turn it into a “just a phase”. We say we want diversity because it sounds good but don’t really make the changes we need.
On the flipside, Authors need to start shaking off the demands and take responsiblity for their own writing. Instead of getting upset when someone “demands” they do XYZ with their book, they need stop and realize that no one is making them do anything and shrug it off. If keeping it the way it is means people don’t like it, they need to own that and stop blaiming beople for their personal tastes. If they want writing to be a business, and their lack of diversity is hurting them, they need to evaluate and decide what they’re going to do about it, and if they decide to do nothing, then to admit that’s on them and no one else.