With the recent “final editorial decision” by @codinghorror to use the share icon for incoming posts, what if clicking the share icon below a post provided an option to “Reply as Linked Topic”? Share currently gives you the link (that you can copy and paste into a new topic to create a link), why not add a button alongside Twitter, Facebook, Google+, and Email to open the New Topic composer and pre-fill the old “Continuing the Discussion from…”?
Edit: Just saw that @cpradio posted this above, sorry for the duplicate post…