The point you appear to be deliberately missing (and I don't understand why) is that if we don't stand up to BA over this, our pay and conditions will be wrecked. If we do stand up to them and bankrupt BA (not that I think that's a practical proposition), I'll still end up on crap pay and conditions, just with someone else.
And you'll also take other BA staff with you!
But an interesting point is raised, if you fight and damage BA your terms and conditions could also be damaged long term. If you don't then your terms and conditions could still also be damaged long term. So what is the lesser of two evils, BA reducing them eventually or some middle east airline coming in in years to come with a take it or leave it attitude to pay and conditions?!?!