That's only true as long as the average rate of fee creation is lower than what can fit in blocks. Since this rate has been rising steadily for years, it's rea

That's only true as long as the average rate of fee creation is lower than what can fit in blocks. Since this rate has been rising steadily for years, it's reasonable to assume that it will (probably soon) pass the average network throughout. And then you are left with transactions that will never confirm, especially if they have low fees.