Hmm good question, something like linear curation rewards eh? Hmmm. :D

Hard to say actually, it might disincentivize distribution and incentivize self-voting and vote-trading again, for the latter I had an idea in mind to discourage it from happening as there's still a lot of it going on and people caught doing it go crazy when they get downvoted and retaliate. Will have to wait for my next post but hmm, I need to think about your question a bit more and run some simulations in my head. :D