I think countries holding large amounts of US dollars have a large incentive to talk up its value while quietly selling it off.
However those countries can probably use their influence over the US dollar to influence US policy and perhaps that is a benefit they have factored into to their currency holdings.
I'd say the chances of a collapse are unlikely unless the US decides to play 'chicken' with its creditors and is unwilling to align its spending and earnings.
In the end, I agree with the author that we'll see a downturn worse than the 30's. Most people didn't see that one coming either.
You're also probably not including the part in the comments where he says Federal spending has to be cut 134% to "balance the economy," citing an article he read somewhere but can't seem to track down right now. And then the part where he repeats the unsourced, unexplained claim.
C'mon. The guy's a crank, and not even a Jude Wanniski-caliber crank. Just because he hates WIPO doesn't mean he's right about anything else.