We might fall into the somewhat unique category as well, but would definitely hugely benefit from this flow, as we'll have millions of potential topics (i.e. books).
We're using Discourse for our forum already (amazing stuff!) and have been wrangling with how to do comments on our site. We implemented Disqus but there were a lot of shortcomings, so we've backed that out, started to think about rolling our own and then this update happened.
Hoping to keep our community all connected within Discourse by adding discussions to books and books lists using this approach. But, we wouldn't want to create a topic for every book in our database, only needing topics as the discussions start.