What choice is there at this stage? As things stand the government isn't shifting, the overtime ban probably isn't going to change anything in that respect. So if the union and members aren't prepared to accept what's on the table, its likely this dispute will run on for at least another 18 months until the GE. And if after what will have been 2 and a half years of ongoing disputes aren't resolved and the dispute remains in it's current state, who is to say an incoming Labour government are going to prioritise it over all the other issues? Certainly Labour haven't exactly committed themselves to change much around public sector deals to date, why would they want to do so with the rail industry? Basically holding on for the GE is a increasing risk now, come early 2025 there may be much less motivation for an incoming government to make instant changes.
The only other way is to escalate the dispute, i.e. increase the number of walkouts. But that risks creeping fatigue amongst members as pay packets start to take the hit. Maybe the government will fold, but frankly being dug in so very deep I think it would take something quite spectacular to drive them out. So the alternative risk is that the dispute simply falls apart, leaving the government where they are and with no dispute to resolve for Labour. Unions don't always get what they want, and it is always up to the top table to weigh up the risk when deadlocks occur, and give an honest appraisal to their membership.