Comment by toomuchtodo

If it could exist during our lifetime, assuming the capture and storage of encrypted message streams is trivial to well resourced threat actors (nation states), if the cost is reasonable to implement quantum mitigations it is reasonable and prudent from a risk management perspective to do so.

The worst case scenario is nation states consuming and storing these encrypted message streams, and suddenly achieving the ability to rapidly decrypt everything previously captured and stored a la "No more secrets."