The huge flaw with that proposition (and any attempting to decouple vote value with stake) is it incentivizes the creation of millions of accounts to game the system. Basically, you end up with a system that is still stake weighted, but instead of tokens supplying the value, it's actual accounts that you collect. Whoever controlled the maximum number of accounts would be able to game curation the hardest.
I'd imagine this will be a big issue with ONO and any other platform that attempts to use a more "socialistic" approach. The only solution I've thought of (which is presently impractical because the technology implementation is currently lacking) would be a DNA interface with technology that verified one's unique identity. That way anything from a purely stake-weighted to purely identity-weighted (even) scheme of voting would be possible to implement.
But this DNA recognition technology would have to be mass adopted, which would take a lot of time since so many would object on various grounds. I predict we will be heading that direction in the coming years, but whether it takes 20 years or 100 remains to be seen.
We can move a long way from weighting curation at the square of stake before we get to the point where it's beneficial to spread stake out, though. For that to happen you'd have to get enough below linear to cover the operations cost. If we went to n^1.1 there'd be enough wiggle room to undust the plankton.