Here is the thing though. You think that when this huge shock is coming, the government will just stand by, watch the US currency get decimated, see the use of bitcoin take over, and just watch it happen? Back in 1971 when the US went off the gold standard, they did it to protect the US currency. Just watched a documentary on it actually. England was worried US was printing too much money, so they wanted some gold. In order to save the currency, US took the currency off the gold standard. Do you really not think the US will do anything necessary to protect the US dollar again? Will they really let you pay your taxes in bitcoin?When the next real great depression soon comes, that the fed can't print their way out of, we'll see how many people are employed by TBTF banks.
When the next big problem hits, the US will do whatever necessary to protect the US. But in no way will they let a competing form of payment take over. Actually, it might well be another shock to the system that takes down bitcoin. People won't be able to convert it back to US dollars fast enough when shit hits the fan. The US dropped the gold standard over one weekend and it was finished.