Well, there has been thefts in dollars for values order of magnitude higher than the Bitcoin theft. It just happens that th peress has given a lot of publicity to the Bitcoin one, while it almost never reports the numerous dollar thefts.
So do you think the dollar is a failure? (I do, but for other reasons).
I don't think the dollar is a failure per se. I can see how the inflation of the dollar and the growing US debt is going to be a problem if nothing is done to balance the US trade deficit, which is really the core issue as I see it. However, this is what happens when you decide to stop printing more money and instead cut public expenditure:http://i.imgur.com/BbR6f.jpg
So you're damned if you do and damned if you don't, so I don't see what a new currency is going to fix if the fiscal policy remains the same.