Leave it up. According to the current upvotes, at least 12 people haven't seen it before (like me) or think it's worth seeing again.

Yeah, I hadn't see it and this is right up my alley.

I think once something is around a year old it really isn't a dup anymore, but rather a "classic" if it gets the votes. The classics I post in my Hacker Newsletter each week usually get a lot of clicks because of this.

Nah, it was a while ago, and it's a good article :-)