Sure, but the workers don't have to take a shave to prop up a failing business model. Sure, they COULD just go somewhere else, but it's reasonable to first negotiate with the employer, because, ideally, the employer doesn't want a whole section of their workforce to just leave.
When I was much younger, a few years out of high school, I ended up being the last developer on a sinking ship, and had asked for a pay raise to get me up to where the highest paid of the employees who had left were, IIRC that was around $5/hr, and was denied. I should have used that as an RGE, but instead just hung on until around a year later when a job fell into my lap. But the employer would have been hurting if I left, and was definitely more expensive for them to lose me than it would have to keep me. But in the end, the parent company folded a couple years later because of a very, very bad bet they made.