People are leaping over the edge because they feel duped on the issue. It's sort of like studying for two weeks to ace a big exam, only to find out that the person sitting next to you copied all your answers. Maybe that person isn't a "bad" person. Maybe they had something going on that put them on the edge of desperation. Maybe they just don't have what it takes to succeed in the class no matter how hard they try. Or maybe they are just ****ing lazy. No matter how you slice and dice it, it isn't fair to you who got the A, and more importantly it isn't fair to the rest of the class. Disability insurance is meant to be for people who are physically unable to work, and treatment that would allow them to work isn't possible. That's it. It isn't meant to be a cop out for those who have been "left behind" in the labor force. Also, being "unable to keep up" with a changing job market isn't a justification for pretending to be "disabled." That isn't the purpose of the program. Period.
Lastly, it would be a flawed (by design) study to see how many people are "abusing" disability benefits when the qualifications for disability benefits are not well defined. That is my point, maybe you only find half of 1% of blatant fraud within the system, but that would be completely ignoring the number of people who "legitimately" qualified due to either ambiguous standards or exaggerated hardships. The rule changes need to come first as a proactive measure rather then a reactive one to some "study" that was flawed before it was even conducted.
Overall, it seems you think this is an issue, you are just skeptical of it being a "big" issue.
(BTW, no its not that they are just "getting older" considering all the statistics in the article are strictly about the working aged on disability.)