I like the ideas. Something like @dustsweeper but for comments that get upvoted could also help. Basically, people with not enough hive power to upvote comments send funds to an service account like dustsweeper and when you upvote a comment it adds to the vote to reach the threshold taking that from your balance in a way that can't be exploited.
What used to help a lot for engagement was the Hive Engagement League from @abh12345
Also, the general trend just seems to be that most voting power is with some of the curation accounts who upvote posts that look like quality often from the same authors who don't really bother to grow their accounts but systematically cash out or delegate their stake to get more passive earnings.
Some kind of incentive switch needs to be made there one way or another. I'm thinking of writing a more detailed post about this issue.
It does feel though like the general interest around Hive is picking up again and more of the ones who are invested woke up looking for ways to fix key issues that have been here for long as the price of Hive has been pretty dead and they don't want to miss the possible bull run.
RE: Comment rewarding idea