If 80 upvotes on a minor release post is any indication I'd say HN's love of Rethink is very much not a thing of the past. Glad you had a good experience, I helped right it back in the day.
Rethinkdb is a kind of perfect piece of program but never been in production. Meanwhile, I know some companies who still stuck with a single giant Mongo db that couldn't scale anymore. And of course a push for Mongo Atlas, smh.