I personally don't see 85% of rentals being 1bcx as a glaring indicator of accuracy. It could also be a glaring indicator that the marketing team is doing an incredible job of bringing on new players. Or it could be that 85% of players at this moment haven't worked their way up into higher level cards yet.
It took me awhile to move to higher level cards. I was still learning all the level 1 cards. That's probably less of an issue in modern though.
I don't have insight into all the numbers yall have though and ultimately I do think this is a good idea and will be voting for it with my 11k staked sps.
Opinion of a gold level player that owns max silver level summoners and meta cards. Personal goal is to get on the modern silver leaderboard once untamed is gone. The investment required to go higher now or do it faster doesn't seem reasonable to me