The bigger the bubble the longer it takes to collapse, US Dollar bubble is over 100 years old, there is no saying how many years it will take for the dollar to collapse.
One is certain, it will happen in the future, this, or some kind of global war and inception of whole new currency which will emerge from the crisis.
Anyway, let me assure you - the worse standard economy based on fiat is doing the happier bitcoin holders will be.
I doubt that money can be in a bubble
Basically, that would mean that today's prices don't match (or rather severely mismatch) the amount of money in circulation. Technically, this is only possible when the government, all of a sudden, prints an insane amount of money overnight and dumps all of it into the economy. That could be loosely construed as an instant currency bubble (but it will be very short-lived, anyway). Personally, though, I don't know about such events (this doesn't mean that they are completely impossible, of course). Other than that, if prices closely follow the monetary supply (which is certainly the case with the US dollar as well as other major currencies), there cannot be a currency bubble
