Why do you keep focusing on on 2001/2002, a period of gross Dollar overvaluation and compare it today, a period a gross Dollar undervaluation (on a PPP basis)? The truth is IMO somewhere in the middle. The Dollar is now "just" 10% lower than it was in 1991, 18 years ago. That's a breathtaking decline of an annualized -0.6%. Is that a collapse? If the Dollar is set to collapse ("To fall down or inward suddenly") then it hasn't happened yet.
The emphasis on the time period between the changing of decades is there because as most people would agree on that time marked the change in business cycles which policy makers clearly have been trying to counter by debasing the currency. If you believe this correlation is true and will remain to be so in case of further economic weakness you could see why people feel attracted towards betting against the USD even today.
Imagine how compelling the economic arguments for betting against the USD felt in 1979, 1988 and 1992 and 1995.