You're right, when I was thinking about how to make bots at least a little bit less harmful, I was starting from the current conditions where almost no changes are happening. I was looking for the easiest and, accordingly, the most real mechanism.

Your proposal is more thoughtful, it is more perfect, but it is much more difficult to implement.

I also like @michelangelo3's suggestion in this post. It would be great if Steem could implement something like AutoEarnings, when the investor would receive his annual interest and at the same time he would not need to trash the blockchain. Then there would be no need for voting services. In this case, the investor would "lock" his SP for high annual interest.

If today's voting services were to die, they would pave the way for a whole new generation of bots, ones that would bring value to the blockchain.