@Andrew - Seriously Yes! But instead of integrating Disqus or other 3party apps, if D7 commenting is upgraded to that level... That would be a major milestone for the whole D7 community owners as well as users

@Houston - Posting in D7 comment box stays inside the site alone... with Disqus like feature it is as well shared to other community sites of the user. which increases the linkbacks for the user accounts