Over the years, I am willing to bet that the average US adult over the age of 40 will have given their SSN to hundreds of organisations already... There is no realistic way to guarantee the secrecy of an SSN at this point - Equifax's breach notwithstanding.
For me, the takeway isn't that the supposedly private SSN has been leaked but that it's been leaked with so much other information that, all added together, give bad guys a fantastic haul with which to run amok.
This, combined with the timing of the notification and the dodgy answers coming back from the automated online systems telling you that you "may" have suffered shows a total lack of regard for your data! You are now purely a commodity that corporates can use to their own ends. This is so glaringly obvious now.
Why companies are allowed to hold so much info on us is the issue here: moreso, why are they not held to the highest of standards? Even a simple "each bit of personal data given to the wrong person will result in a $500 fine for the company" would soon add up.
The danger is that these companies (I mean all the credit agencies) push this onto the consumer to "manage". In fact, now that I read this back, it's pretty much a certainty at this point.
Unless someone goes to jail, or Equifax are shut down Arthur Anderson-style, then this will disappear!