It might not be possible to create a public forum in a way that it stays thoughtful and interesting even when it becomes popular. The first problem is that tho

It might not be possible to create a public forum in a way that it stays thoughtful and interesting even when it becomes popular. The first problem is that thoughtful and interesting content rarely attracts many readers. The second is that if many readers show up, the discussion quality is going down. So there would need to be strong centralized censorship to downvote the low quality posts and prevent accounts that play the populism game to gain traction.