These are few and far in between. Regarding people losing trust in the US dollar, I think many other fiat currencies would first have to lose this trust in them, and the dollar will be the last to fall. But even without the dollar going belly up, other currencies may contribute greatly to Bitcoin popularity. I mean when they all start crashing down, and it will the American dollar against which they will be losing.
I disagree a little bit with this obviously some currencies are going to fail before the dollar but I think the dollar is going to fail eventually, it does not need to happen tomorrow but it will happen at some point in the future probably in some decades, and when that happens all the currencies are going to fail as well.I see no viable reason why other currencies should necessarily fail as well if the dollar is going to kick the bucket. All major currencies are not tied to it in a way that would make such conclusion meaningful. Why Euro or Swiss franc should fail if the dollar dies? In my view, they will only get stronger due to the dollar demise. Euro will be the first to take the place of the dollar as the main world reserve currency once this place becomes vacant.
I agree that many countries, for example, China and Russia, keep their reserves in dollars. But these reserves consist not only of dollars. Both China and Russia are also net buyers of gold. Besides, as far as I'm familiar with the question, the dollar reserves roughly match national debts of these countries denominated in dollars. So even if the dollar collapses, their dollar debts will evaporate as well.
Therefore it won't be a great loss for them.
