Agreed, even if Bitcoin is a great financial technological advancement, it's still quite volatile, but considering the Dow Jones' fluctuations over the last 113 years it's almost a safe haven, since most countries do not consider it a currency, but an asset! The Dow Jones was up or down almost 50% every 2 years for the first 90 years since 1900.
By the definition of a Ponzi scheme, the USD is the Killer Whale of all Ponzi schemes -
http://en.wikipedia.org/wiki/Ponzi_scheme - imagine 3 to 5 of it's top foreign bond holders selling back their "assets" still holding value backed by global military oppression and possibility of invasion, it would completely throw the US into a situation not dissimilar from one of those epic Hollywood disaster films Mad Max.
Isn't it curious that Russia managed to confront the US immediately with it's Achilles heel, threatening to dump all of Russia's US Bond holdings?! Everyone knows this, that is "important" enough, or has the clarity to understand. However at this point the global economy is so intertwined these kind of threats and notions will not only destroy the US, but affect every nation globally, very few have the resources and the strength to weather the collapse in confidence of this wall of debt. The obvious and visible signs are probably nothing compared to the shadow banking (derivatives market).
Bitcoin would not have been a problem if the global reserve currency wasn't the USD, yes long time friend of the US and the Bushes, Saddam, tried to sell his oil in EURO, and yes Gaddafi, also long time friend of all G7 nations tried to convert the sales of oil for all OPEC countries in Africa and the Middle East to the Gold Dinar, and look what happened to their countries... (also they are dead?!)
Politicians will always be liars, it goes with the job, for better of worse, but when people become complacent and leave all the important decisions to people who obviously serve themselves, of course powerful families and corporations take advantage!
Would most dissenters really act so differently if they were in the same position of power (wealth) given the effort and dedication you would have made to get there? No excuse for immoralities though!
Nouriel Roubini is not entirely credible, in a high estimation he barely got the last downturn prediction correct, he just cried wolf louder than others, some people like the media limelight. Robert Schiller, John Paulson or Peter Schiff have a far clearer and unbiased view of the economy and tend to be much more reserved and knowledgeable in the manner they approach subjects regarding the economy.
This doesn't mean they like Bitcoin, they just do not ignore the facts regarding the USD, it's nearly toilet paper in every way, one just needs to know when the largest holders of the USD are ready to let go and absorb the sunken cost to profit from the such an inevitable decline, the Federal Reserve is just postponing at this point.
Bitcoin may be damaged by the attacks of central banks, as they cannot afford it's success, but the motivated and very talented backers of the crypto currency economy need to work together to overcome it's weaknesses.
