Whatever racial or gender or economic biases might exist that influence the shape of the global developer community, these need to be addressed at the source: in kids' youth when many programmers take on computers as their lifelong obsession, or in high school curricula and college programs.
The conference organizer's job, as it pertains to race and gender bias, is to provide a neutral selection process that chooses the best speakers on their own merits. Their job is not to diminish the quality of the conference by imposing their own, nobly intended but horribly misguided, form of bias on the candidates. More than hurting just the conference or the candidates, I fear that this can have serious unintended consequences relating to public perception of the quality of e.g. female programmers, in the same way that "affirmative action" does on college campuses.