"You need to be very adaptable, so that you have a baseline skill set that allows you to be a call center operator today and tomorrow be able to interpret MRI scans."
I'm not sure if this is just naivete or Silicon Valley hubris, but this statement doesn't really make much sense. MRIs are interpreted by MDs (radiologists) with years of training. Call centers can be staffed by high-school drop outs. I have friends from both ends of the spectrum in exactly those jobs and I can tell you the starting point for each career and baseline skill set are not the same. Note that baseline intelligence may be the same - my call center friends are all phenomenal musicians who put their intellectual effort into music and use call center jobs to pay the bills, but there's no way they're interpreting MRIs in this lifetime.
I'm seeing the same high level of hubris in tech right now that I saw (and was guilty of) in 1999. There seems to be this feeling that good software skills are a proxy for any other discipline. After all, if I can write an MRI app for an iPhone (or, in the 90s, if I could write a Web 1.0 MRI viewer - which I did, fwiw), then I'm clearly qualified to take the next step and start diagnosing patients (or better yet, just write an app for that, too). Once you know the jargon and basic requirements, everything else is just implementation details, right? Of course, the reality is is that those implementation details are years of dedicated training, not a few weeks of hacking. You only get so many years in life - you can't do everything with them.
In Bock's comments, I see either ignorance or sleaziness. Maybe he really believes that anyone can and should be anything and everything. In that case, he's wasting his time in HR and should become a motivational speaker. But, it also seems like he's just using this as a way to get more call center operators to believe that there's a career path at Google that will allow everyone with a CS degree to be true renaissance people. Sure, every now and then one will pull it off, but people also win the lottery. That doesn't mean everyone will.