I can think of 1000 use cases for strong anonymity.
Thinking of switching a job, thinking of getting a divorce, becoming a whistleblower, investigating symptoms of a disease you may have, forming or joining a union. Or even just showing your irrational spending habits.
These are middle-class, non-criminal things.
Folks will be oppressed on an unprecedented scale, and very cheaply.
Additionally, if we continue without taking action, society will be affected on an unprecedented scale by dataminers from the future. Data collected now or a decade ago may be mined by sophisticated algorithms created a decade from now.