I like this idea. A possible use case could be a daily discussion thread about a specific topic. It can be seen on reddit, that this will be work. I like to read these daily discussion threads on reddit for cryptocurrencies. I'm convinced that this could also work on steemit.

So we need a several daily discussion threads, which are created by a bot on trending topics. The steem user can then upvote good contributions and as an extra bonus , the best comment wins something on top.