I’ve been thinking about the same thing. Something styled along the likes of HN (Eg super minimal), but focussed on technical/HN-crowd topics and every post on the front page is a blog post, and every user profile shows all those user’s posts.
Akin to Medium or Wordpress.com but minimal and very technical.
Of course it’s easy to make such a site, but getting enough people to contribute and get it going will always be the hard part.