User blog comment:Dopp/Message Wall Now Available in Labs/@comment-4578246-20120128104128/@comment--20120129221157

To answer your questions and feedback: We're still not sure if this will be optional or not. At this time it is definitely optional, though. As for replies to replies, we've looked into this and may of course continue to make tweaks, but we feel as though the current design is consistent with similar platforms across the internet and that adding extra layers may make conversing harder and more complex than it needs to be.