While I am still new to Hive I think any functionality that incentivises reblogging and rewards that is a win win. So long as there are controls in place to ensure abuse does not occur why should there not be more incentive to reblog.
From what I have read in your post and from what I understand of the Hive system and wider ecosystem I would imagine there are a few nuts and bolts to work out before implementing such an idea. But given that innovation is one of Hive's greatest strengths and we clearly have the technology to implement your reblog concept, albeit with a few tweaks if needed, there should be no reason why it can't succeed.
Let's be honest who doesn't like seeing their own posts reblogged? Precisely.