Good points. For a community there are quite a lot of blogs that don't get a lot of interaction.
Commentrewarder you mention is a good example of this PoVS change you mention and with the @topcomment curation service we also try to motivate more hivers to engage more.

Yes, I think we are moving more and more towards this PoSV paradigm. It is not just commmentrewarder and topcomment but things like KE and POSH also contributing to this shift.

We also now have all these snap, waves short content stuff.