I've noticed a trend lately (like in the last couple years). Comment thread lifespans are becoming shorter and shorter. I'm usually good about going back to my messages, and keeping up conversations in the thread. It seems not everyone else is.
If anyone who programs here reads this, do your own research against the database, and see what mean life expectancy of comment threads is. I almost guarantee if you run it against all stories from the beginning, you'll see it's tapering off.
What I have observed with my comments, even the occasional first post, is that the thread will die off at about 2 to 3 days, regardless of how interesting the conversation is getting. It seems people just aren't interested in going to older stories, which isn't surprising since it's a pain to get to older stories. Look for a story from two weeks ago. Type in some keywords in the search? No way.. Pointy-clicky through the More buttons, good luck there.
Still, it's easy enough for people to keep up with running conversations. Well, I assume so. When we were forced into the new theme, I had to be sure my messages box was at the top left. Maybe I'm one of the few who actually set up for that, or most people are set for no notifications. Either way, it's becoming disappointing where conversations don't run their course. I don't think it's me... I have week and month long conversation threads going with friends and colleagues, even if every 3rd message (for colleagues at least) is "you are dumb, now send what we asked for".
So back to the topic... I wish more of you would keep up your ends of the conversation. It's hard talking about interesting subjects, and when I've written a well thought out reply, it's just exceeded the MTTL (mean time to live) for a thread, and it's abandon. Well, except for the random troll who goes back through old threads and writes TL;DR, but he barely counts as anything.
Maybe Slashdot can gear up something more conducive to actual conversations, rather than a few hundred drive-by comments that are dead end conversations. I really miss the intellectual (or quasi-intellectual, sometimes) conversations, now replaced by a short thread lifespan and high churn of stories.