Alright I see what you're talking about. Now that I know you're putting in work to matchmake 3 stacks against 3 stacks I'm fine.
I have another idea I wanna run buy you. What if we added rank demotion BUT make it like Arena Ranked where you get ranked rewards based on the highest rank reached? So people wouldn't 'stop' playing as once they get to (P4, D4, Masters) they still get rewarded on reaching their highest rank. This is in reference to the comments under your most recent tweet.
I'm trying to accommodate players who just want to get ranked rewards (badge+trail) and the players who rightfully complain that hardstuck randoms play with 0 fear since they're aren't punished for making dumb plays.
That's a thread on reddit about that right now... Tldr; Demotions would be ineffective at addressing the reckless play behavior. Because: "If I've hit my peak, I can troll anyways anyways, since I've gotten my reward already." Demotions are good for other things, but Not for this one specific thing.