At any rate, the impact of these sorts of tax issues on Bitcoin (and vice versa) is almost zero. You can't really hide assets in Bitcoin unless you plan to live your retirement largely within the Bitcoin economy, which would make you probably the most optimistic risk taker in the whole world.
I disagree and think the impact is material. Bitcoin is
moving the Freeline in all three areas of cost (money, time and privacy) and therefore
currently in charge of the
currency market change.

FATCA increases the cost of using USD for both tax compliant and non-compliant by (1) increasing privacy and time costs by having to spend time filling out reports of foreign financial accounts and disclosing the balances. These costs are born by both the tax compliant and non-compliant.
In terms of money, for those that are non-compliant the penalties and increased probability of being caught evading taxes raises the cost or risk adjusted cost in terms of money. But even for the tax compliant Bitcoin reduces the money costs in terms of processing fees and risk adjusted counter-party risk (bank failure, MF Global type embezzlement, etc.).
Because Bitcoin is moving the Freeline and is in control of the currency market change therefore it will continue pulling in capital and increasing the network effects which increases the probability that you could 'live your retirement largely within the Bitcoin economy'.
Economics guides behavior and behavior shapes culture. Bitcoin has fundamentally changed the economics of the currency market and is begininning to have an effect on individual behavior. As network effects take place and individual behavior begins changing on an
increasingly exponential scale this will result in a change of culture. And it is this fundamental change in economics that is the real threat from Bitcoin to the establishment.

