My hypothetical is post-hyperbitcoinization

In a world with 8B people using only 21M Bitcoins, the amount of value you would have to provide to ever accumulate a full coin would be huge - far too much for most people. Since by then, most people with full Bitcoins would be second generation Bitcoiners, they likely wouldn’t have the frugality required to keep that amount of money without spending it down. I personally think this will happen around 2M whole coin UTXOs, but it will be very interesting to observe. The rolling over of whole-coin addresses would represent to me the maturity of Bitcoin as global money.