Great tool! It highlights one disadvantage of the proposed governance change - it becomes easier to take over the chain because the whole decentralized body is much slower to act than any potential hostile centralized entity. With this change, the decentralized body becomes smaller because now only those of it who have been active in governance over the last year are counted.
It would be awesome if we can find a way around that, so as not to weaken the chain's resilience. After all, the simulation shows a big drop in witness support. It becomes easier for sophisticated folks to bulk-buy millions of Hive at a huge discount (or even coordinate an attack on large stakeholders) and do a 51% attack.
If we want to exclude people who have died or become inactive, then wouldn't counting any activity (as opposed to only governance activities) do the job?