You are most likely right. That would however leave balpa exposed to a breach of contact with every none ba member in the country. A dilemma that must surely be weighing on their minds.
We all had exactly the same thoughts when the unprofitable BA absorbed us profitable Cityflyer types. I was months away from a 146 command and here I am stuck in the RHS of a 747. However, I earn more than I would have, I have a lifestyle pretty much everyone would desire and I love my job.
I think most of the anger will dissipate once everyone realises how good BA is.