500 Gp per week is extremely easy to do, the goal of this change is to be able to beat the top ranked by tryharding in a shorter amount of time, what you are advocating for is for you to be able to tryhard for a bit of time then sit on your lead for a long time and do w/e the fuck you want with it. That's exactly what we want to avoid with this system. I see absolutely nothing wrong with what you say in your second paragraph, all of the downsides you see are the upsides we see, there is no reason you should keep governor rank if you are not tryharding 24/7, why should you ? Other people want to invest more time and more energy, and you shouldn't be rewarded for having taken a long term lead, top 100 should reflect the most invested player AT THAT TIME, not 1-2-3 months ago.
Taking someone out of the ranking system, i.e. setting their gp to 0 after one week of under 500gp contribution is absolutely minimal, you would have to avoid doing any siege and not do swb, litteraly being afk a week means you're out of the game instead of deranking which is already quite fair on this server with the double rate.
What this system advocates is increasing the TURNOVER RATE of top 100 players, which can only have a positive impact on the game for everyone. I don't know if you realize how crippling it is to have our top 100, even our top 3, siege has been trash for most of the time since i joined, commanders can't speak english properly if they try at all (it is not my first language btw so they have no excuses), siege could be so much better instead of asmodians camping prades killing ppl out of gp zone and elyos camping bassen doing exactly the same and everyone is bored.