You might be right for some of these, but for others, I have a hard time imagining a context that would change the basic idea.

Maybe something like "Folks, the Mac platform is through - totally [according to some idiot I was talking to yesterday...]"

In reality, some of these predictions were perfectly reasonable given the information on hand at the time. If you had asked me twenty years ago if elementary school kids would be carrying around individual wireless phones the size of a matchbox today, I would have been highly skeptical. Then you could have thrown in that these phones would play games and take movies...