It is a thing that needs to be corrected in the future, I feel like coin weight depreciation could be a potential fix, Coin stake weight becomes increasingly harder to get the more coins you have, Coin age weight should remain the same a linear increase. this way having more grc will let you stake more but it prevents extreamly large holders from staking nearly all the blocks.
With only 960 blocks a day its only going to get harder and harder.
Alternatively the minimum stake cooldown gets increased from 16hours.