Interesting idea, but I think the comments count; "x comments" should probably be clickable as anyone from HN will instinctively click that, not the "discuss" text.
plural = "s" if comments > 1 else ""
"%d comment%s" % (comments, plural) if comments > 0 else "Discuss"
I also miss seeing the clickable domain next to the submission's title rather than all the way down at the bottom
"%d comment%s" % (comments, "s" if comments > 1 else "") if comments > 0 else "Discuss"