We can only talk about something for about 2 days here, and then container story gets buried no matter how important the topic.
I've thought of this as a problem as well. Slashdot also disables comments on a story after some time. One thought I had was the ability to post stories under a set of tags, and people could view all the stories under a set of tags and view all the comments under a set of tags. Hopefully the tags wouldn't dilute the conversation too much - I'm not sure it's a good idea, actually, but might spark someone's imagination.
I'm actually not a Doctor Who fan (nothing against it... i'm too impatient to watch it) so I may be misunderstanding how "regeneration" works, but imagine for a second a Doctor who's been a man for over 10 generations who wakes up to realize he's now a woman! It might be interesting if they scripted it as if the woman still had the mind of the original male Doctor. "man realizes how some people treat women" angle. "man can't wait to be a man again" "man spends too long in the shower washing his privates" I dunno.
New York... when civilization falls apart, remember, we were way ahead of you. - David Letterman