I am sure I’ve read/heard @manton stating the same thing, he is in favour of other micro.blog like communities.
I’ve been a member of a few educational communities and projects built round aggregations of blogs. I’ve even set up one or two wee ones.
There folk need to go out from the central hub to individual sites to join the conversation. If, and it is a big if at the moment, all the sites had webmentions enabled I am sure it would be possible to reply straight on the hub, but the reply would be sent to the original post.
This would need a bit of work on the hub, it would incorporate something like quill as a method of replying. Perhaps it would be simple to do with FeedWordPress just adding a link to pop the quill editor up… But the harder part if for community members.
For most people installing and configuring the themes and plugins needed for WordPress is a bit of a barrier. Setting up another system would be too I think.
In the future, when hubs like micro.blog abound, I’ll be able to be part of many communities using this site, categories or an other taxonomy will direct posts to one or more hubs when needed.