– The SPS
I am against this protocol at this time. I don’t think it will have much of an impact at all around here except to waste more of our inflated tokens. It’s certainly not something that’s a priority. There are much bigger problems to address.
If, for some reason, the community insists that we need it, then the funding should come from a combination of SP “interest” (which should be eliminated entirely) and consensus witness rewards. Taking the funding from the overall content rewards isn’t ideal.

Good point. I don't want pay for SPS. Why authors must loss potential money? Better to add additional inflation.

2 – Convergent non-linear rewards curve
I am in favor of this simply for the fact that it’s better than linearity. My preference would be something like n(log n) or an algorithm with similar impact on rewards.

Heavily difficult worthless curve. I don't say that we must safe current curve but I see new curve will hit small authors.

3 – 50/50 rewards
I am absolutely in favor of this and I think this will have one of the most meaningful impacts on behavior. I actually believe that 50/50 does not go far enough in terms of incentivizing risk-taking for those who power up STEEM. I would like to see it closer to 60/40 or 65/35 in favor of curators.

Bad idea. Steem really under dump pressure. 50/50 decreasing reward for creators. I don't understand who really need this hardwork? For curators? Big fishes? For investors? Do you waiting that new curation percent kill bad behavior? Impossible.

4 – Free downvote pool
I’m indifferent to this, but I feel that it could have some meaningful impact if users can overcome the stigmatism of downvoting content. The toxic culture that has been built around disparaging those who use downvotes for reward disagreement is pretty much disgusting and entirely antithetical to the system design.

Not so bad. Give to community powerful tool to let it make steem better. I really think we must have option downvote delegation to create kind of decentralized moderator who can make steem greater. Flags doesn't worked on current moment properly.