Keith Weiner rightfully notes that it is the struggle of the debtors that gives the US$, or any other fiat, its value. But there is a little more to it than that.
It is also the desire to gain and to hold dollars in order to secure a future that gives them value. Some people accumulate in order to invest, or simply in order to have something to draw on in their old age.
The persistent, but incremental, fall in the value of the dollar (as measured by Gold) is unobservable to the accumulators or, so slow, that it is not regarded as a significant factor. They regard the dollar as a viable way of securing their future.
The bottom line is that while yes, it is the struggle of the saver that keeps the dollar strong, there must also, always, be a perception of quality attached to it.