I think it's a good idea, but I think for it to be successful, a UI change is needed. Communities still seem kind of buried, at least to me. Ideally, when you log in your communities feed should come up, not individuals you are following, or maybe even a mix of the two.
Of course, this might just be me never using hive.blog and mostly peakd and ecency(okay, I just logged in to hive.blog and it goes straight to communities, nice!). It would also be cool if an author could pin comments on their articles, like on youtube comments.