Digg is apparently trying to piggyback the reddit chaos and is talking about bringing back comments. I haven't really used Digg since about 2008, but I'd be tempted to stick around for a bit to see how they implement comments.
<a href="https://hubski.com//pub/240732">Discuss this on Hubski.</a>
I don't think Digg will ever get back to how big it was, whether they bring back comments or not.
I don't think it will either, but I'm interested to see what they do.