Ah, but when you read stories like this, I wouldn't trust the reporter (or even the interviewee) to be 100% accurate. "All crashed" could mean anything from a dead battery to being PIN locked to failure to launch because of an expired code signing cert :P
Good point and definitely possible. In fact I've done it myself - switched computer rejected the old certificate and suddenly nobody could access the app. Fortunately at the time it was only a few people and a beta so not too big of a problem.