You could whine all day here and complain against the inevitable, or you could use that same amount of time, and reach out to your ex-coworkers that have found gainful employments elsewhere and more than happy to help you network for the yet-to-be-filled positions. I have already helped two current employees here with setting up their interviews and I know I am not the only one.
I had the same feeling of wasted efforts and disappointment as all of you- and I am more than happy to exacerbate Glofo's severe attrition problem by networking for you which hopefully resulting in gainful employments elsewhere.
But you have to reach out to your ex-colleagues. Linkedin is a great place to start.