The reasons why the U.S. dollar has been trading well since the financial crisis is because of hope, hype and speculation.
Schiff alluded to the immense trade deficit with China, and how China is producing all things the U.S. consumers and can't produce. On the other hand, however, the U.S. doesn't produce anything the Chinese want to consume.
https://www.lewrockwell.com/2015/08/no_author/the-dollar-collapse-is-coming/