The thing here is, he is well known in the field of economics
I dont take this as a positive. And Rickards is a gold bug, beating the same drum for years.
Actually the dollar is more than just the economic assets tied to it. It is actually all the activity tied to it. When you look at the liquidity, depth, derivatives, and sophistication, it is unrivaled.
It is the only international currency with the euro being second, operating on a regional basis.
That's all true, going for more research on how currencies works.