I reckon that they will battle through this lack of controllers they have at the moment with overtimes/ADs as it will cost less than training the required amount of new controllers.
Then, once new technologies are upon us that will reduce manning (especially full procedural sectors), the aging workforce will have retired and they won't need to sack many, if any at all, saving a little face and, I'm sure, a nasty union confrontation.
Anyway, an interesting topic.
Cheers,
NFR.