I'm not sure an on-chain solution is ideal. I can think of plenty of scenerios where resteem curation can provide a valuable feature. Honestly, I think the problem is because "steem" and "steemit" are still interchangable. What we really need is a seperate "uncensored chaotic mess steem viewer" and a "technically censored (in the sense dtube censors non-video content) steemit blogging platform." Like, steemit should force a tag like the other dApps do. But right now, they obviously can't, it would kill every other dApp.  
So right now we are stuck in the unfortunate situation where a specific use case dApp is also trying to be a generalized hub. I have no idea how we deal with these growing pains.