>>Could someone with billions of dollars of personal wealth exert enough influence on the dollar to drive it down after buying positions in the international marketplace betting on the dollar to go down?
Not enough to make a difference. $4T of currency is traded every day.
“>>Could someone with billions of dollars of personal wealth exert enough influence on the dollar to drive it down after buying positions in the international marketplace betting on the dollar to go down?”
I would ask George Soros and the Bank of England. That could give some insight to your question. It has been attempted.
Soros has openly admitted he is shorting the dollar heavily.