I also have the financial sense to save for a rainy day and not leverage myself to the eyeballs. I've been months without employment in recent years, and my family was provided for quite well despite the disquieting uncertainty.
So what? Most people will put themselves and their family well being ahead of pride. Why should the IT staff quit because they have to train their replacements? Why should the IT staff make a financial decision, that can have serious consequences, based solely on pride? The IT staff received 6 months notice about the change. That’s 6 months to look for a job without using their savings. What you are suggesting makes no sense even if you have the savings to carry you through until your next job.