The advent of Quantum Computing will render all data that is password protected and encrypted open to the user of the right tools. Not only would this be a revolution in the security field, in a similar vein to Dreadnought in the 1900s, it will also have profound effects on everyday society.
Unless this is managed globally, there could well be a scenario where one or two states (or companies) have the ability to look at the world's data with no vice-versa deterrence in place.