I think it’s possible for the services to come together and develop a standard for commenting systems (as suggested by Dave Stanley of Shyftr). This standard would provide a framework for updating comments across the blog, commenting systems, and third-party services (like FriendFeed or Shyftr).
Of course this also requires input and cooperation from these third-party services for this to really work. The ultimate goal: distributed conversations with aggregated discussions.
What future implications do you think this will have on how you blog and participate in discussions?