Well, probably everything has been said by now. Flags aren't free, they have a social cost. And a big issue in the reward economics is that we force people to participate in something they don't care about. Those will always go the easiest route to make their profit, which under superlinear means automation towards successful authors. With n^1.x less than in the old days, but probably still noticeable.
The reward economics would drastically change when staking is more profitable than vote farming, the assumption that it'd stay the same doesn't make sense to me. There'd be no more bid bots and self voting, as those looking to maximize profits wouldn't participate in that econ any more.
But that's running in circles with assumptions on both sides, no way to tell with certainty without testing in the live environment.
Anything that makes bidbots less profitable is good, and that's something your suggestion will definitely achieve!