This is an interesting proposal but I doubt it would change much..top witnesses vote each other and as a consequence there is a huge divide between them and the rest of the other lower rank witnesses, even with 90% of their votes they would still be ahead most witnesses. There is just the illusion of a democratic system, truth is it's up to a privileged few to decide which witness will rank higher and it's not always for merit. The little guy can do whatever but if he doesn't belong to the "circle" he is never going to make it to the top. Of course the whole community looks bad for this and obviously those at the top have no interest in changing anything.