If we're just concerned with the average quality of discourse, it would be simpler to just cut off the whole community and go back to dialogues between Eliezer and Robin,.

The most significant dialog between Eliezer and Robin (Foom debate) was of abysmally low quality - relative to the output of either of those individuals when not dialoging with each other. I have been similarly unimpressed with other dialogs that I have seen them have in blog comments. Being good writers does not necessarily make people good at having high quality dialogs. Especially when their ego may be more centered around being powerful presenters of their own ideas than in being patient and reliable when comprehending of the communication of others.

If we want high quality dialog have Eliezer write blog posts and Yvain engage with them.