Curation rewards for downvoting makes so sense since you are removing value from the post or maybe you were refering to something else?
I think curation rewards should just be removed: I'm not the only one apparently 
Dan said 
> I'm in favor of the new curve and eliminating curation rewards

These rewards are the source of a lot of problems. The argument for keeping them is that investors won't have any incentives to buy steem power. This is incorrect. The value of the platform will be a lot higher in the eyes of investors if curation rewards are removed, no more bots, quality content, fairer distribution, less greed mentality, more appealing for other website to integrate, more comment voting, less confusing for newbies, more engagement,etc..all of these will make the platform a lot more valuable than it is now.
Special benefits could also be given to users who refrain from voting so investors can make extra passive income but like I said their passive income is the increase of the value of steem.