France is already taxing the wealthy at 75% even though everyone acknowledges it is not actually going to bring in much if any revenue (wealthy are leaving France).
It is the way to start the demand to tax externally to close all the places the wealthy can run to. G20 has already agreed to cooperate on this and NSA has signed on to providing them the data. I can provide citations.
And later they will be forced to just outright confiscate.
Btw, on the anonymity front, I blew up Zerocash and Darkcoin today: