It's difficult to see who would vote yes to another strike. Some CC have presumably broken the strike out of conviction, some to save staff travel, some because they can't afford it anymore, and some see the writing on the wall - the cause is lost, why lose even more money. It wouldn't be logical for any of those to vote in favour of another strike.
Unless there is another vote for a strike to 'send a message' and hope it helps their colleagues who have lost staff travel, but don't actually intend to strike, and surely they've learnt that lesson!
That just leaves currently striking crew. I don't think they are in the majority!
In any event, the law seems to be written to stop a strike going on and on just by reballoting, is there not a clause about any extension strike ballot not being about the same items?