I know of one instance from 2019, but I'm pretty sure it happened at least one more time after that (not including this time). If nothing else, maybe someone will learn how to properly set the fee so that their transaction doesn't get stuck for days, or maybe they will discover that there is something called RBF.

Here is how the mempool looked in the past 3 years - > https://mempool.space/graphs/mempool#3y