I think it might be practical to keep wiki discussions on the wiki in some form. For one thing, there will inevitably be a fair deal of discussions that aren't really very interesting to people who aren't active on the wiki. Also, if activity in and around the wiki are relatively self-contained, they'll be easier to keep track of.
That's my two gold pieces, anyway.
![smile smile](/images/graemlins/default_dark/smile.gif)