You then watch pay points change, pilots from another airline get absorbed (a legal requirement)
I don't think they are "YOUR" pay points until you actually work for BA. The BMI guys you refer to do the same job - fly A320s from LHR , so if their company has been taken over why shouldn't they be absorbed, do you expect them to be thrown out so somebody like you can be taken out the hold pool and trained on the 320 to take one of their slots (if you can pass the TR !)
If you really want to work for BA go and get yourself a 320 rating rather than whinging about the selection, then you can get a head start - If thats where you want to work.