I'm sure that Trump is doing this for political reasons, not economic. He's trying to make a point.
But that doesn't matter. He's right that now that he's doing it, others will do so as well.
I've been subscribed to a newsletter that, for years, has accepted gold as a form of payment. There's even a service that provides for gold exchanges, effectively letting people "wire" gold.
Change in our monetary system is slowly occurring. The thing to remember is this: As hot topics as debt and our money are these days, it will NEVER get better. The problems only get worse from now on.