Don’t underestimate the power of the based unions. Most of them have been around for 10 years now, and in that time they have built up a significant war chest in case CX tried to close the base. They also have the backing of real labor laws which protect against over aggressive employers. Whatever tactic CX could come up with has already been tried before and precedent set through arbitration cases. Collective Agreements do expire and eventually allow for strike or lockout action, but that process can take months. It will be a long time before based go away.