Fred, where do you get the idea that you can't be replaced? I assume you are a Nigel from the tone of your post. Well there are hundreds of us out there flying big jets with 1000s of hours accident free who would love your job. Yes, we have chips on our shoulders because we either failed the BA selection or other circumstances. But we are out there flying for EK, CX etc and prepared to come back to blighty for the going rate.
I would guess that 3000 pilots aren't required either as short haul would be scrapped.
I suggest you come to the best deal you can without striking and watch your backs!