I was prepared to say that I'm against the idea until I tried it.
For me the key is: I can edit other people's posts. This keeps it a wiki, and this has very important social implications.
I would be opposed to much use of talk pages that allow for discussions that don't let other people edit.
It is very important as a matter of mutual trust that we *can* edit comments, even if we almost *never* do, as a matter of custom.
Public restaurants might be much safer if every table was in a different room with a locked door. That way, no one could hit each other. But it's good for society that we sit at restuarants peacefully together. Sure, people *could* hit each other, but they *don't*. (Usually :-))
I like it.
--Jimbo