In my view it never did us any good. Its a two edged sward. Sure we can import cheaper stuff with it, but it exports jobs at the same time. So the imports are net not cheaper. And if its such a great status, why do we have a $30 trillion national debt?
I say, let China be blessed with key currency status. Or shove it back onto Great Britain where it was before 1945. Let them import cheaper consumer products from the USA and other countries with THEIR strong Yuan or strong British Pound policy. And shut down THEIR factories for a change.