What you appear to be missing is that the world already has a ‘new’ reserve currency, and the new currency is the old currency: Intrinsic value.
Gold is the most obvious in this, but far from the only element. Intrinsic value can no longer be hidden, nor manipulated by the global elite, because the resources are in fragmented hands that see no value in cooperating.
What will do when uncle Obama confiscates it like his mentor Roosevelt