If their goal is to get as many people as possible to leave voluntarily (so that they don't have to pay a package), why not just get rid of the 9/80?
I'm playing devil's advocate, of course. But throughout my years at Shell, I have heard people complain that Shell does not pay as well as Exxon. But they then say that the 9/80 is the only thing that keeps them at Shell.
So why wouldn't Shell get rid of the 9/80? If their goal is to shed as many people as possible the cheapest way it can, seems like something they should consider.