Maybe just me. But personally, my user experience would be really really improved if there weren't a scheme to change who can vote and how every single week. I actually had a really big deal set up for steem that went to XMR instead after the whole hitler-post voting thing came out.
Just this one guy.
If the goal is really to decentralize whale influence, why not just do it the obvious way. Take ninja-mined vests (ie, any vests mined when mining was open but not really open) out of play for curation (after all, thats not why the ninja mine was there in the first place, it was to raise money for the platform). This would also stop PD cashouts, or at least slow them down, because whales would have to recycle their SP back into vests in order to get their curation powers back. It wouldn't effect investors.
It will definitely not reduce whaletrials because most of the whales have other accounts they can bring into play if they run out of votes, or don't cast their full 40 in the first place.