That's a really nice idea, I'm sure such a site has the potential to generate very high-quality discussions about a topic. The only problem I see, is that the

That's a really nice idea, I'm sure such a site has the potential to generate very high-quality discussions about a topic. The only problem I see, is that the audience of HN (and Reddit even more) is big and has many different interests. It's very hard to cover those interests with only an article a day, and many might just lose interests after a bunch of days without anything interesting for them. Moving the cadence down would probably help, I think the sweet spot might be around 4/6 articles a day. I think I'd also try to bring down the number of submissions compared to HN. HN gets a lot of those, and it's good, but I don't think it would be healthy for such a site. I can think off limiting the number of submissions an account can do every day/week, limiting submissions to accounts older than X days (this is mostly to avoid spam) and/or having a pay-for-submission system (not real money, but karma or other similar things).