I agree evolving the comments is good. I like the promise of disquss but it haven't gained enough traction. I don't trust a commenting system that exists outside my blog. The unreliability of services others provide isn't acceptable to me (look at how many services Google has abandoned - trusting that things will exist doesn't seem wise).
The ability to comment on a blog and have that comment shared (say via Google+ or Disqus or something) seems like it would be nice (but leave the comment in the blog itself so if Google pulls a Google and shutters their commenting everything isn't lost). It would also be great to be able to track comments for a specific person. I find it so annoying I post some of my comments on an old blogger blog I had so I can find them later, if I wanted.
Comments sparked by: How WordPress Comments are Evolving
Related: Your Online Presence and Social Networks for Managers - John Hunter online