That's what I meant by dropping the US dollar from the international trade between countries (other than the US) and switching to regional currencies instead. China and Russia are already going that route, so you, in a way, are a bit late with your fears...
I mean US people, other countries hold a lots of USD reserve, if they abandon it, they lost many years of work, not a wise idea
Why would they necessarily abandon it? They would ultimately send their dollars to where they originated from, that is, back to the USA, trying to buy few goods which the latter sells (I mean the last holders of dollars when you won't be able to buy with them anything internationally in the end). But since the US has a large trade deficit (which is covered by debt), this would inevitably cause a panic sell of the US dollars leading to the devaluation of the US dollar...
And chickens finally came home to roost
Indeed, if they all decided to abandon USD, there will be a large amount of excessive USD out there, but even USD is mass inflated, it still holds better trust than many other countries' currency
Naturally, people won't abandon the dollar just for the fun of it. They would if they somehow lost trust in the US, if the US economic world domination the USA got as a result of the two world wars would be disrupted or tainted in some way. Whether this should happen and whether it is bound to happen (and how soon) remains to be seen, though...