There's so many parallel threads here that it's hard to determine which
one to respond to. Nice to see all this open discussion though! :)
In any case, in regards to choosing future talks and attempting to
ensure speaker diversity, this blog post from Sarah Milstein & Eric Ries
(author of "The Lean Startup" which is also worth a read) just came
across my radar.
It details how The Lean Startup Conference has attempted to achieve a
more diverse set of speakers. Obviously all of what they did may not
apply easily to the code4lib conference, but it's at least worth
reading/skimming in light of all these recent threads.
Technical Lead for DSpace Project