This 5 years the article talk about. Do anyone really believe than in 5 years, they won't extend it further? It will continue to the point in which either everything is stored forever, or push back actually takes away this pandora box from the government.
No goverment ever want to be with less information about the population. If they could predict who is a criminal before a crime is committed, social benefits could be rerouted away. If they could predict who is going to become political candidates, they could adjust information flows away or towards that person. If they can predict who is voting for who, they can direct support/anti-support to "encourage" the right result.
This is why I am worried about a surveillance state. With a large enough database of population information, and prediction models, democracy will be eroded to the point of destruction.