I would much rather redirect some of the inflation from "SP interest" and then eliminate the rest of it rather than pull it all from content rewards. There's more than enough tokens there to cover SPS funding and "SP interest" is an absolute joke, both conceptually and economically.
We can reduce overall inflation (positive for perception and price action), fund the SPS (positive for development), and not adversely affect the content rewards pool (positive/neutral for creators and curators) all at the same time. Why would we not do that?
RE: Steemit Update: HF21 Testnet, SPS, EIP, Rewards API, SMTs!