I don't think it's that important. Everyone will get a smaller part of the pie, but why shouldn't they receive some of it too for their investment. Right now passive investors have the choice between ~15% ROI for screwing the platform, or 0 for not doing it. And more and more decide to join the first group, because they're tired of watching the ones who don't care grow while they keep stagnant.
We need to focus on growing the pie.
The bid bot situation really keeps off a lot of people from the outside. While googling for the original post containing this idea I instead found tons of external links talking about how steem is completely broken. And at least regarding the intention it was created with, it undoubtedly is.
I don't really disagree with the overall theory. If (using made up numbers) it turns out that 75% of the "pie" (inflation) is going towards passive investors, and 10% is going to witnesses, and only 15% is left for content creators and authors - I think there is a valid argument to be made that it isn't working as intended. If passive investors can only make 10% compared to what they would get from bid-bots, then that also won't work. Basically the actual math behind the proposal is very important. All of the actual proposals that I have seen so far to implement an investor class have ended up on one of those two extremes.
This idea is not about by which percentages to distribute inflation, but who gets what from the reward pool. Under this model it could become bigger by removing the current interest on SP, but basically passive investors would get the exact percentage they decided to take out of the voting pool. No further math required.
What about all of the currently non-voting stakeholders who may also take a portion of the investor class rewards?
That's their right then, yes. It would probably lower everyone's ROI, be it investment by stake or by brain. That'd also mean broader distribution of the inflation, which isn't a bad thing in my eyes.
The issue isn't to judge 'right' or 'wrong', it is whether the incentives work out. I agree with @timcliff that the math is very important. If something like this gets implemented and not used by the large amount of stake that optimizes returns because the profit is less than some alternative the it will just add to the pile of technical debt of many, many half-thought-out Steem features that are never used, and also won't bring us any close to a better functioning system. Alternately, if it turns out that it is so heavily used that rewards all but disappear, that may be okay but it would be a careful choice that the Steem community would have to decide is what it wants.
I'd also note this is probably inferior to simply turning off the rewards because proof of stake with high inflation has the negative to inducing a (more than otherwise) negative price trend, which is terrible for PR. Also possibly lack of understanding from investors that the inflation is high but they can get back most/all of it via staking. The latter is essentially the original situation with hyperinflation which was a terrible miss in terms of market perception.
All that said I'm not broadly opposed to the concept and I've been one of the most consistent supporters of investor-class stake that doesn't participate in the social rewards scheme. Still, the details matter to whether it will work. Again, too many aspects of Steem's economy and consensus rules have been put in place without careful economic and game theory analysis. We need to do better going forward, not continue the same careless methods and wishful thinking that have gotten us to this point.
also, I'm not 100% sure if we were the original original, but here is my and @snowflake's posts on it from two years ago:
https://steemit.com/steem/@snowflake/guardian-of-the-steem-universe-a-different-perspective-on-the-role-of-whales-within-steem-ecosystem-part-2
https://steemit.com/steem/@timcliff/whales-can-the-community-buy-out-a-portion-of-your-influence
https://steemit.com/steem/@timcliff/update-on-the-whale-buyout-proposal
No, as stated in my reply in the previous comment, this suggestion is a lot simpler in nature.
Edit: found it with the help of @meno!
https://steemit.com/steem/@tcpolymath/a-simple-radical-change-to-steem-that-could-fix-most-of-our-problems