Good thoughts there @scipio, especially the one about having less witness votes then there are consensus witnesses.
I agree with what a few ppl before me already mentioned, having the possibility to disapprove (also stake based) will not make the big change (if any).
But having less witness votes, especially something far less than 20, will for sure create some movement because then the owners of the big stakes can not decide by themselves any longer who is a consensus witness and who is not. Which is in my opinion a very good thing, because it will decentralize the whole topic a lot.
Keep the ideas coming @scipio ! :)
Kind regards
Jan