Your comment implies that you think that content/experience is orthogonal to a diverse speaker group.
I strongly disagree. I think a diverse speaker group leads to overwhelmingly better content and experience.
I think this extends much further than gender or race, however. I think this extends to the totality of human experience. I have a great interest in seeing the technical community encompass as wide a range of people as possible.
I want this partly for reasons of equality and fairness, and partly for purely selfish motivations (plainly that I want to work in an industry made up of people with a wider range of experiences, it makes me happier).
I think conflating a desire to see a diverse population of speakers to people's t-shirts probably means that you and I aren't going to see eye to eye on this subject. Which is fine, as I don't think you're a racist, or sexist, or a terrible person.
I do feel pretty confident betting that in 200 years, we'll see a much more heterogeneous makeup of both speakers and conference attendees, regardless of whether an active effort is made to make that so (it'll happen eventually).
Some might say if that's the case eventually, than shouldn't people just pretend that it's the case now (in which case drawing attention to gender and race is actually doing more harm than good).
I'd argue that if people agree that that's what the future is going to look like, and by most accounts, that seems like a better future, than why the hell aren't we doing more to turn the present into that future.