Obviously the powerful or rich can spy on everybody's finances now, easily, pervasively, and routinely, no matter what we do. So privacy as we have known it is effectively over
I think anonymous currency will eventually lead to the collapse or crippling of the state. People will just hide their money and they'll be unable to finance the bureaucracy/control grid that gives them the power to do things like that. So on one hand, the "global ledger" is a severe globalization and possible enslavement tool, but then anonymous currency counter balances that aspect, or possibly overruns it entirely.
Anonymous currency = Atlas Shrugged
I think the state is doing a great job of collapsing itself.
I think a bigger cause of the demise of the state, will be a blockchain backed decision making process, making the states secretive and corrupt nature finished. And with that the corruption, wars, etc.
Related will be what technologies like nxt and etherium will do to "business".
I'm not sure of the importance of an anonymous btc. Don't think we even need a separate anonymous currency, but I think regulators may lead to one.
The event horizon here, I think, is more than we can imagine....