While I agree with your over/underestimate statement, I unfortunately think you've got it backwards, where we're overestimating the change this pressure is going to lever on how our data is utilized in the short term, and underestimating the reversion to the mean.
Next to companies like Palantir, AT&T(Room641A), Equifax, and hell, even credit card processors, I've always found the ire directed at Facebook to seem... scapegoatey? I'd observe that anger against those companies was quick to fade, and has not seemed to negatively impact employees to work for them, nor created a regulatory environment wherein that work isn't supported. (selfishly us-centric here)
Hell, after the snowden revelations, did those with NSA/govt credentials have trouble getting a job? If that didn't move the needle (and I say this as someone who had been doing gov. funded research at the time, and would have liked to see a stronger response) I'm pessimistic that we'll ever see meaningful long term perceptual shifts in this respect outside of when they're driven by a media-cycle furor.
(To address the root of this comment tree, I think the fad hasn't outlasted the media cycle, I think the media cycle has realized this topic continues to drive clicks for now)
Simply, I worry a lack of privacy, and lack of accountability for corporations/govt, has largely become normalized; or at least that people are increasingly unlikely to act in this direction without heavy media pressure. I hope I'm wrong.