I do try to keep my fingers on the pulse of what 'blogs' are doing as an overall niche. I would say that the days of having a blog being a conversation-pit are long over; blogs are largely broadcast-only media. Any comment systems are more for fan discussions. The writers of blogs take suggestions, act aristocratically and thank certain people, but never get down in the trenches to wrangle big issues anymore.
Blame personal branding for this, I suppose. Once you label yourself 'brand', you never want to dilute that edifice. Engaging with others on their blogs would classify as dilution, as well. Or posting rejoinders on your own blog, even. This is why we're seeing moderated, limited-broadcast-range discussions over on Facebook. Less damage to the 'brand', controllable messaging. Twitter was never an option; any discussions pushed there become cryptic, misproportioned things. [I envision gargoyles as the result (I'm a visual person, remember).]
All that being said, my use of Squarespace's built-in commenting has been largely a bust. Should I switch to Disqus? Are you more comfy with that service now? There were concerns early on, but it seems everyone has sort of lapsed into Disqus as the catch-all these days. Press a 'like' here if you'd prefer Disqus.
Off on a tangent, I see Facebook will be adding 'lists'. More signs of the older demographic taking over the service; "gotta remember the milk and toilet paper before the snow storm."