That is exactly the dilemma we face at the moment. If we vote Yes, then BMI is integrated in BA short haul, with all the problems that will entail. We (BA pilots) have been told we have to help finance it by reducing our T&C's.
Alternatively, we vote No and IAG buy BMI and set up BA Express with reduced T&C's and use it as a wedge to reduce BA's salary bill at LHR.