It looks like more of a headline whiny type of research article.
Couple things to keep in mind:
-per report it includes anything reported as a collection whether or not its been settled, paid, discharged which can stay on your report for 7 years and doesn't discriminate by amount. I have near perfect credit and pay stuff on time but there have been instances where a doctors invoice or some other innocuos bill has gone unoticed that has shown up on my report. For discussion purposes lets assume that accounts that go into debt collection are fairly consistent by year - that would mean that 1/7th of the of accounts in collection are current/recent issues meaning that while 35% of the credit population has a debt collection on its record only 5% occured recently (IMO this would be far more informative to understand the trends)
- what about fraud items, someone opens an account under your name fraudently and is caught until that moment when you try to get a loan or then the credit reports shows that account past due and in collections - that will take two years to get off your record.
- affiliations/errrors, people incorrectly assume that credit reports are based on your social sec number, that is only part of the case, it is based more on name and address commonalities. I have had debts of other people show up on my credit report many times.