The site has unnatural links problem with Google for over a year now. The traffic is stable even when this problem is still actual. Check this screenshot -
https://www.dropbox.com/s/j9cyqbgz56...53.50.png?dl=0
I don't know how much it can help to solve this, maybe it can double SE traffic, maybe not, who knows. Back then the site used to have around 40k/day from Google.