Anyone who discredits the 'seniority system' (for all its faults) and BALPA (for all their faults) should read this thread.
Its been a ten year race to the bottom and Eastern, by the sounds of it, are very close to it.
My sympathies, but if you can get out, do, you will at least have a couple of years before you start to complain about the next employer!! We are all in the same boat, I just have a better quality cabin!!