Diversity problem? Nonsense! Just look how many succesful Speculative Fiction authors are female: Andrea Norton, Susan Cooper, Connie Willis, Ursula Le Guin, Julian May, Nancy Kress, Octavia Butler (black, as well as female) and dare I say it, J.K. Rowling - all off the top of my head.

Then there are well known award-winnning gay authors such as David Gerrold.

And I've just finished reading last year's Hugo Award winning novel "The Three Body Problem" written by Cixin Liu, a Chinese SF author.

If anything, SF is the field of fiction which has the least problems with "diversity" - its readers are open-minded almost by definition!