If it's a "no", I suspect there will be a vote of no confidence and a new GC will form, so DSS will not be involved. What DSS has to say is irrelevant.
If it's a "yes", I suspect the union will be a lot smaller. What would be the point of having a union, the GMA says the company is going to play nice. Job done. Stand down. Take yourself a 1.25% payrise. So again, what DSS has to say is irrelevant.