Slashdot is still going strong, and it's been the worst there is at what it does for a decade now.
The people who are still using Slashdot are the people like me who cannot overcome the "sunk Cost Fallacy" and move elsewhere. There is maybe, MAYBE one or two articles a week now that are worth my time on Slashdot. The tech board on 8chan is more lively and interesting. And there are some people there who do just about everything in tech from finding virus vectors to virtual engineering to building gamming PCs. The meme people will flood Imgur and deal with that bad website (Twitter with pictures IMO and I FUCKING HATE twitter). The thing I miss about Reddit are the niche gaming subreddits like for EU4 and Crusader Kings and even Elite Dangerous. The Kerbal Space Program subreddit was the best place in all of Reddit, again in my opinion. People will leave and form communities and those communities will gain a reputation just like Slashdot, Digg, Reddit, SlackNews, 4chan Neogaff etc did before them. Hubski may be small, but the signal to noise level here is amazing. I'm here for the long haul.
yeah, but what's slashdot's percentage of the market in comparison to reddit (I actually have no idea)? the site will still function, I'm sure - with the amount of websites that rely solely on it for content it's almost in a "too big to fail" caliber - but I can see a lot of user base moving off of reddit to find their next fix awfully quickly. And I don't say that to disparage those people (it probably sounds like I am), it's just that humans act very differently as a mob than they do as individuals.
Natalie Portman and oatmeal are dead, Netcraft confirms it. Slashdot fails as a news site because it's slower than everyone else, the best comments are redundant because everyone reading slashdot is also reading reddit and hackernews and LtU and ..., and because Slashdot is the last to post the interesting comments have already been made. Even its memes are stale. CmdrTaco himself gave up on it after the OMG Ponies! april fools thing. The moderation system is clever, but the community just kind of froze somewhere between 1999 and 2006. It's sort of comforting, because geek culture has gotten a lot less fun in the mean time if it's still even a thing outside of marketing, and Slashdot is a sort of unliving Pompeii that's a lot like the good old days except with more dust and ambulatory corpses, but it's not "stuff that matters" anymore.
And really, all of this is compounded with the current ownership structure at Slashdot. Dice has been destroying a lot of good faith with their moves at SourceForge, and ThinkGeek's sale to Gamestop. Slashdot is pretty much living on borrowed time.
About a year ago, the issues at Slashdot came to a head with the botched rollout of the new "beta" interface. The redesign reflected a complete disconnect from the community, and prompted a large scale "slashcott" boycott/revolt. This ended up resulting in the creation of SoylentNews, and the migration of a chunk of the community. Dice has continued to demonstrate a complete lack of understanding and simply rolls forward with more additions of sponsored content, video content that no one asked for, and most recently, outright replacing the "Read the [n] comments" link with a social media "share" button. I see a LOT of parallels with the situation at Reddit.