Treasury Boycott Thesis
I am surprised that Rosenberg brings this up because in my mind, this hash has been settled long ago.
What exactly would China, Japan, and Germany do with their reserves and ongoing trade surplus? Mathematically they have to do something.
Historically, that something has been to buy treasuries. But I suppose China could buy could be gold or US equities. The latter would be smack in the middle of an obvious bubble.
And if China were to dump US treasuries, the alleged nuclear option, it would serve to strengthen the Yuan. Recall that China sold US treasuries to support the Yuan and stop capital flight. In a trade war, China would not want an appreciating currency!