The doom of the US dollar is pretty much expected to happen after several decades. I don't see it as a tragedy. Global finance will definitely recover after the end of the US dollar dominance. Every crisis is an opportunity, like the Chinese say.
This is what the American nation will get, after voting for politicians, who offer stupid short term solutions for all problems.
No national currency can survive as a global currency in the long term. The world needs a truly global currency, which isn't tied to any particular country(and I'm not talking about Bitcoin). I'm one of the people, who think that Bitcoin cannot serve the world as "the one and only" global currency.