If government monopoly profiteers de-cash society, in order to impose negative interests, is that not also a crime?

Sir, Kenneth Rogoff writes:“[In] advanced economies, the idea of recalibrating the use of cash is an entirely reasonable one. While paper currency has many virtues that will continue into the distant future (including privacy…) the vast bulk is held in large denomination notes such as the US $100 and the €500 that have little significance in most retail transactions. A broad array of evidence suggests that high-denomination notes… mainly serve to facilitate tax evasion and crime.” “India’s cash bonfire is too much, too soon” December 10.

I have two questions: 

First: Is not the US $100 and the €500 the most effective tools for privacy?

Second: Is not cash, one of the last resources you could use to defend yourself against negative interests?

In future presidential electoral debates anywhere, a citizens obligatory question could be: "Sir, do you want to screw us getting rid of cash, so as to make it easier for you to pay off government debts with negative interests?"

@PerKurowski