Sacking certain managers - much as I'd like to - doesn't put money in the bank now, when you need it. Going on strike won't generate money that isn't there. You have to deal with things as they are, not how you'd like them to be. Part of the process of getting what you want is recognising the realities around you and working within the limitations that exist. You can't turn a poor economic situation into a good one by claiming that there's money hidden away somewhere; show us that money and we can all lay a claim to a share of it. If you (or the Union) can't show it to us, we have to work on the assumption that it's not there, as all the economic data leads rational observers to believe.
I understand your feelings, but you can't fix the problems by telling people there's money lying around when there plainly isn't. Take what's on offer, then spend the time before the next pay negotiations (which will start in about a year's time) obtain ing the data to inform your standpoint, instead of relying on rumour and conjecture. Knowledge is power, and you and your Union plainly don't have it.