Also (having gone to the kitchen for a glass of water and thought of more on the way back), you need to realise that what you just suggested is something we hear *all the time*. People saying "sure, our community sucks and is sexist, but you would all just hang around and take it for a while, it might get better." Sometimes there's also an implication that it's our *duty* to hang around and do so.
Sorry, no. I'm a busy person with a lot of stuff going on. How about the existing members/commenters on LWN pick up their acts, and then when you have, we might find that we have the energy to come here and talk about other things.
FYI: how we (geek feminists) usually judge whether a site's worth spending our energy on, is to look at how they behaved in the last discussion on sexism. If we see a site where people saying "sexism doesn't exist" or "women just aren't interested" are in a startling minority and are set straight immediately, then that's somewhere we can feel reasonably safe and welcome. Otherwise, we mostly just roll our eyes and avoid (I do this for /. and digg, for example) or occasionally dive in to specific threads, wear ourselves out, then disappear til the next round.
Consider LWN lucky that we do dive in here occasionally, rather than just avoiding it entirely.