While the concept of unions seems okay, most of the implementations are corrupt power-grubbing monstrosities that long ago quit actually seeking to get the best outcome for the workers.
I think a better plan is living well within your means. If you can do that, while the severance is nice, you don't need it and thus it is easy to tell the company where to shove it if they pull crap like that.
I've got plan A down. Plan B remains on the table, unused. (Well, to be fair, I used a modified B where I didn't immediately quit but instead requested a transfer to a different department by applying to the only open position they had -- a 1 year contract spot. It ruffled some feathers, but got an internal full-time transfer offer. Not ideal, but good enough to let me change career direction while looking for a new job elsewhere in the new direction. Took 6 months, was all good (for me).)
I'm sure someone will come in and talk about privilege. That's fair, but isn't privilege a given since we're talking about an IT dept? They don't have a lot of salaries on glassdoor, but there are a couple sysadmin at 90k, network admin at 115k, and a single hourly sysadmin contractor at 40/hr. We aren't talking about people scraping by at min wage, we're talking about people who are overall being paid pretty well who don't apparently have a 6-month cushion tucked away.