First, just have to collapse all the shares before the dollar itself will collapse. Therefore, to go to the fact that the first thing, with the destruction of the entire financial system, will collapse, I would not recommend.
You should think that if a dollar collapses, the entire financial system will collapse and cryptocurrency will not save anyone. Reality will live well China, which today is buying up all the gold and silver, and selling Bitcoin to fools. After all, no one today will doubt that almost 70% of all Bitcoin transactions are controlled by Chinese miners.