My own company was acquired a few years ago. As soon as the transition was made I began making plans for a career change. I did this even though I saw no evidence that the new situation would be a disaster.
You do know that not everyone can just pick up and move, don’t you? You do know that for certain people the job market is very, very tight and not getting better, right? So to just flippantly tell people go somewhere else is rather myopic. It is not as if they don’t know their options or the time it may take to get there. It’s just that for many the practical steps of doing so are not going to happen overnight.